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Use the term "radix tree" instead of "suffix tree" for SP-GiST text opclass.

Browse Source 
What we have implemented is a radix tree (or a radix trie or a patricia
trie), but the docs and code comments incorrectly called it a "suffix tree".

Alexander Korotkov
This commit is contained in:
Heikki Linnakangas 2013-05-08 14:29:28 +03:00
parent 20c00ca668
commit cb953d8b1b
9 changed files with 201 additions and 201 deletions
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2
doc/src/sgml/indices.sgml
View File

@ -267,7 +267,7 @@ SELECT * FROM places ORDER BY location <-> point '(101,456)' LIMIT 10;
SP-GiST indexes, like GiST indexes, offer an infrastructure that supports
various kinds of searches. SP-GiST permits implementation of a wide range
of different non-balanced disk-based data structures, such as quadtrees,
k-d trees, and suffix trees (tries). As an example, the standard distribution of
k-d trees, and radix trees (tries). As an example, the standard distribution of
<productname>PostgreSQL</productname> includes SP-GiST operator classes
for two-dimensional points, which support indexed
queries using these operators:

10
doc/src/sgml/spgist.sgml
View File

@ -15,7 +15,7 @@
<acronym>SP-GiST</acronym> is an abbreviation for space-partitioned
<acronym>GiST</acronym>. <acronym>SP-GiST</acronym> supports partitioned
search trees, which facilitate development of a wide range of different
non-balanced data structures, such as quad-trees, k-d trees, and suffix
non-balanced data structures, such as quad-trees, k-d trees, and radix
trees (tries). The common feature of these structures is that they
repeatedly divide the search space into partitions that need not be
of equal size. Searches that are well matched to the partitioning rule
@ -81,9 +81,9 @@
A node contains a downlink that leads to either another, lower-level inner
tuple, or a short list of leaf tuples that all lie on the same index page.
Each node has a <firstterm>label</> that describes it; for example,
in a suffix tree the node label could be the next character of the string
in a radix tree the node label could be the next character of the string
value. Optionally, an inner tuple can have a <firstterm>prefix</> value
that describes all its members. In a suffix tree this could be the common
that describes all its members. In a radix tree this could be the common
prefix of the represented strings. The prefix value is not necessarily
really a prefix, but can be any data needed by the operator class;
for example, in a quad-tree it can store the central point that the four
@ -636,7 +636,7 @@ typedef struct spgLeafConsistentOut
<para>
Individual leaf tuples and inner tuples must fit on a single index page
(8KB by default). Therefore, when indexing values of variable-length
data types, long values can only be supported by methods such as suffix
data types, long values can only be supported by methods such as radix
trees, in which each level of the tree includes a prefix that is short
enough to fit on a page, and the final leaf level includes a suffix also
short enough to fit on a page. The operator class should set
@ -740,7 +740,7 @@ typedef struct spgLeafConsistentOut
<para>
The <productname>PostgreSQL</productname> source distribution includes
several examples of index operator classes for
<acronym>SP-GiST</acronym>. The core system currently provides suffix
<acronym>SP-GiST</acronym>. The core system currently provides radix
trees over text columns and two types of trees over points: quad-tree and
k-d tree. Look into <filename>src/backend/access/spgist/</> to see the
code.

14
src/backend/access/spgist/README
View File

@ -2,7 +2,7 @@ src/backend/access/spgist/README
SP-GiST is an abbreviation of space-partitioned GiST. It provides a
generalized infrastructure for implementing space-partitioned data
structures, such as quadtrees, k-d trees, and suffix trees (tries). When
structures, such as quadtrees, k-d trees, and radix trees (tries). When
implemented in main memory, these structures are usually designed as a set of
dynamically-allocated nodes linked by pointers. This is not suitable for
direct storing on disk, since the chains of pointers can be rather long and
@ -56,18 +56,18 @@ Inner tuple consists of:
optional prefix value - all successors must be consistent with it.
Example:
suffix tree - prefix value is a common prefix string
radix tree - prefix value is a common prefix string
quad tree - centroid
k-d tree - one coordinate
list of nodes, where node is a (label, pointer) pair.
Example of a label: a single character for suffix tree
Example of a label: a single character for radix tree
Leaf tuple consists of:
a leaf value
Example:
suffix tree - the rest of string (postfix)
radix tree - the rest of string (postfix)
quad and k-d tree - the point itself
ItemPointer to the heap
@ -122,7 +122,7 @@ space is as good as we can easily make it.
(2) Current implementation allows to do picksplit and insert a new leaf tuple
in one operation, if the new list of leaf tuples fits on one page. It's
always possible for trees with small nodes like quad tree or k-d tree, but
suffix trees may require another picksplit.
radix trees may require another picksplit.
(3) Addition of node must keep size of inner tuple small enough to fit on a
page. After addition, inner tuple could become too large to be stored on
@ -132,14 +132,14 @@ another page, we can't change the numbers of other tuples on the page, else
we'd make downlink pointers to them invalid. To prevent that, SP-GiST leaves
a "placeholder" tuple, which can be reused later whenever another tuple is
added to the page. See also Concurrency and Vacuum sections below. Right now
only suffix trees could add a node to the tuple; quad trees and k-d trees
only radix trees could add a node to the tuple; quad trees and k-d trees
make all possible nodes at once in PickSplitFn() call.
(4) Prefix value could only partially match a new value, so the SplitTuple
action allows breaking the current tree branch into upper and lower sections.
Another way to say it is that we can split the current inner tuple into
"prefix" and "postfix" parts, where the prefix part is able to match the
incoming new value. Consider example of insertion into a suffix tree. We use
incoming new value. Consider example of insertion into a radix tree. We use
the following notation, where tuple's id is just for discussion (no such id
is actually stored):

4
src/backend/access/spgist/spgtextproc.c
View File

@ -1,7 +1,7 @@
/*-------------------------------------------------------------------------
*
* spgtextproc.c
* implementation of compressed-suffix tree over text
* implementation of radix tree (compressed trie) over text
*
*
* Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
@ -23,7 +23,7 @@
/*
* In the worst case, a inner tuple in a text suffix tree could have as many
* In the worst case, a inner tuple in a text radix tree could have as many
* as 256 nodes (one for each possible byte value). Each node can take 16
* bytes on MAXALIGN=8 machines. The inner tuple must fit on an index page
* of size BLCKSZ. Rather than assuming we know the exact amount of overhead

10
src/include/catalog/pg_proc.h
View File

@ -4700,15 +4700,15 @@ DATA(insert OID = 4026 ( spg_kd_inner_consistent PGNSP PGUID 12 1 0 0 0 f f f f
DESCR("SP-GiST support for k-d tree over point");
DATA(insert OID = 4027 ( spg_text_config PGNSP PGUID 12 1 0 0 0 f f f f t f i 2 0 2278 "2281 2281" _null_ _null_ _null_ _null_ spg_text_config _null_ _null_ _null_ ));
DESCR("SP-GiST support for suffix tree over text");
DESCR("SP-GiST support for radix tree over text");
DATA(insert OID = 4028 ( spg_text_choose PGNSP PGUID 12 1 0 0 0 f f f f t f i 2 0 2278 "2281 2281" _null_ _null_ _null_ _null_ spg_text_choose _null_ _null_ _null_ ));
DESCR("SP-GiST support for suffix tree over text");
DESCR("SP-GiST support for radix tree over text");
DATA(insert OID = 4029 ( spg_text_picksplit PGNSP PGUID 12 1 0 0 0 f f f f t f i 2 0 2278 "2281 2281" _null_ _null_ _null_ _null_ spg_text_picksplit _null_ _null_ _null_ ));
DESCR("SP-GiST support for suffix tree over text");
DESCR("SP-GiST support for radix tree over text");
DATA(insert OID = 4030 ( spg_text_inner_consistent PGNSP PGUID 12 1 0 0 0 f f f f t f i 2 0 2278 "2281 2281" _null_ _null_ _null_ _null_ spg_text_inner_consistent _null_ _null_ _null_ ));
DESCR("SP-GiST support for suffix tree over text");
DESCR("SP-GiST support for radix tree over text");
DATA(insert OID = 4031 ( spg_text_leaf_consistent PGNSP PGUID 12 1 0 0 0 f f f f t f i 2 0 16 "2281 2281" _null_ _null_ _null_ _null_ spg_text_leaf_consistent _null_ _null_ _null_ ));
DESCR("SP-GiST support for suffix tree over text");
DESCR("SP-GiST support for radix tree over text");
DATA(insert OID = 3469 ( spg_range_quad_config PGNSP PGUID 12 1 0 0 0 f f f f t f i 2 0 2278 "2281 2281" _null_ _null_ _null_ _null_ spg_range_quad_config _null_ _null_ _null_ ));
DESCR("SP-GiST support for quad tree over range");

218
src/test/regress/expected/create_index.out
View File

@ -72,13 +72,13 @@ INSERT INTO quad_point_tbl VALUES (NULL), (NULL), (NULL);
CREATE INDEX sp_quad_ind ON quad_point_tbl USING spgist (p);
CREATE TABLE kd_point_tbl AS SELECT * FROM quad_point_tbl;
CREATE INDEX sp_kd_ind ON kd_point_tbl USING spgist (p kd_point_ops);
CREATE TABLE suffix_text_tbl AS
CREATE TABLE radix_text_tbl AS
SELECT name AS t FROM road WHERE name !~ '^[0-9]';
INSERT INTO suffix_text_tbl
INSERT INTO radix_text_tbl
SELECT 'P0123456789abcdef' FROM generate_series(1,1000);
INSERT INTO suffix_text_tbl VALUES ('P0123456789abcde');
INSERT INTO suffix_text_tbl VALUES ('P0123456789abcdefF');
CREATE INDEX sp_suff_ind ON suffix_text_tbl USING spgist (t);
INSERT INTO radix_text_tbl VALUES ('P0123456789abcde');
INSERT INTO radix_text_tbl VALUES ('P0123456789abcdefF');
CREATE INDEX sp_radix_ind ON radix_text_tbl USING spgist (t);
--
-- Test GiST and SP-GiST indexes
--
@ -288,79 +288,79 @@ SELECT count(*) FROM quad_point_tbl WHERE p ~= '(4585, 365)';
1
(1 row)
SELECT count(*) FROM suffix_text_tbl WHERE t = 'P0123456789abcdef';
SELECT count(*) FROM radix_text_tbl WHERE t = 'P0123456789abcdef';
count
-------
1000
(1 row)
SELECT count(*) FROM suffix_text_tbl WHERE t = 'P0123456789abcde';
SELECT count(*) FROM radix_text_tbl WHERE t = 'P0123456789abcde';
count
-------
1
(1 row)
SELECT count(*) FROM suffix_text_tbl WHERE t = 'P0123456789abcdefF';
SELECT count(*) FROM radix_text_tbl WHERE t = 'P0123456789abcdefF';
count
-------
1
(1 row)
SELECT count(*) FROM suffix_text_tbl WHERE t < 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t < 'Aztec Ct ';
count
-------
272
(1 row)
SELECT count(*) FROM suffix_text_tbl WHERE t ~<~ 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t ~<~ 'Aztec Ct ';
count
-------
272
(1 row)
SELECT count(*) FROM suffix_text_tbl WHERE t <= 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t <= 'Aztec Ct ';
count
-------
273
(1 row)
SELECT count(*) FROM suffix_text_tbl WHERE t ~<=~ 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t ~<=~ 'Aztec Ct ';
count
-------
273
(1 row)
SELECT count(*) FROM suffix_text_tbl WHERE t = 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t = 'Aztec Ct ';
count
-------
1
(1 row)
SELECT count(*) FROM suffix_text_tbl WHERE t = 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t = 'Worth St ';
count
-------
2
(1 row)
SELECT count(*) FROM suffix_text_tbl WHERE t >= 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t >= 'Worth St ';
count
-------
50
(1 row)
SELECT count(*) FROM suffix_text_tbl WHERE t ~>=~ 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t ~>=~ 'Worth St ';
count
-------
50
(1 row)
SELECT count(*) FROM suffix_text_tbl WHERE t > 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t > 'Worth St ';
count
-------
48
(1 row)
SELECT count(*) FROM suffix_text_tbl WHERE t ~>~ 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t ~>~ 'Worth St ';
count
-------
48
@ -952,195 +952,195 @@ SELECT count(*) FROM kd_point_tbl WHERE p ~= '(4585, 365)';
(1 row)
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t = 'P0123456789abcdef';
SELECT count(*) FROM radix_text_tbl WHERE t = 'P0123456789abcdef';
QUERY PLAN
------------------------------------------------------------
Aggregate
-> Index Only Scan using sp_suff_ind on suffix_text_tbl
-> Index Only Scan using sp_radix_ind on radix_text_tbl
Index Cond: (t = 'P0123456789abcdef'::text)
(3 rows)
SELECT count(*) FROM suffix_text_tbl WHERE t = 'P0123456789abcdef';
SELECT count(*) FROM radix_text_tbl WHERE t = 'P0123456789abcdef';
count
-------
1000
(1 row)
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t = 'P0123456789abcde';
SELECT count(*) FROM radix_text_tbl WHERE t = 'P0123456789abcde';
QUERY PLAN
------------------------------------------------------------
Aggregate
-> Index Only Scan using sp_suff_ind on suffix_text_tbl
-> Index Only Scan using sp_radix_ind on radix_text_tbl
Index Cond: (t = 'P0123456789abcde'::text)
(3 rows)
SELECT count(*) FROM suffix_text_tbl WHERE t = 'P0123456789abcde';
SELECT count(*) FROM radix_text_tbl WHERE t = 'P0123456789abcde';
count
-------
1
(1 row)
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t = 'P0123456789abcdefF';
SELECT count(*) FROM radix_text_tbl WHERE t = 'P0123456789abcdefF';
QUERY PLAN
------------------------------------------------------------
Aggregate
-> Index Only Scan using sp_suff_ind on suffix_text_tbl
-> Index Only Scan using sp_radix_ind on radix_text_tbl
Index Cond: (t = 'P0123456789abcdefF'::text)
(3 rows)
SELECT count(*) FROM suffix_text_tbl WHERE t = 'P0123456789abcdefF';
SELECT count(*) FROM radix_text_tbl WHERE t = 'P0123456789abcdefF';
count
-------
1
(1 row)
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t < 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t < 'Aztec Ct ';
QUERY PLAN
----------------------------------------------------------------------
Aggregate
-> Index Only Scan using sp_suff_ind on suffix_text_tbl
-> Index Only Scan using sp_radix_ind on radix_text_tbl
Index Cond: (t < 'Aztec Ct '::text)
(3 rows)
SELECT count(*) FROM suffix_text_tbl WHERE t < 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t < 'Aztec Ct ';
count
-------
272
(1 row)
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t ~<~ 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t ~<~ 'Aztec Ct ';
QUERY PLAN
------------------------------------------------------------------------
Aggregate
-> Index Only Scan using sp_suff_ind on suffix_text_tbl
-> Index Only Scan using sp_radix_ind on radix_text_tbl
Index Cond: (t ~<~ 'Aztec Ct '::text)
(3 rows)
SELECT count(*) FROM suffix_text_tbl WHERE t ~<~ 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t ~<~ 'Aztec Ct ';
count
-------
272
(1 row)
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t <= 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t <= 'Aztec Ct ';
QUERY PLAN
-----------------------------------------------------------------------
Aggregate
-> Index Only Scan using sp_suff_ind on suffix_text_tbl
-> Index Only Scan using sp_radix_ind on radix_text_tbl
Index Cond: (t <= 'Aztec Ct '::text)
(3 rows)
SELECT count(*) FROM suffix_text_tbl WHERE t <= 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t <= 'Aztec Ct ';
count
-------
273
(1 row)
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t ~<=~ 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t ~<=~ 'Aztec Ct ';
QUERY PLAN
-------------------------------------------------------------------------
Aggregate
-> Index Only Scan using sp_suff_ind on suffix_text_tbl
-> Index Only Scan using sp_radix_ind on radix_text_tbl
Index Cond: (t ~<=~ 'Aztec Ct '::text)
(3 rows)
SELECT count(*) FROM suffix_text_tbl WHERE t ~<=~ 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t ~<=~ 'Aztec Ct ';
count
-------
273
(1 row)
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t = 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t = 'Aztec Ct ';
QUERY PLAN
----------------------------------------------------------------------
Aggregate
-> Index Only Scan using sp_suff_ind on suffix_text_tbl
-> Index Only Scan using sp_radix_ind on radix_text_tbl
Index Cond: (t = 'Aztec Ct '::text)
(3 rows)
SELECT count(*) FROM suffix_text_tbl WHERE t = 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t = 'Aztec Ct ';
count
-------
1
(1 row)
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t = 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t = 'Worth St ';
QUERY PLAN
----------------------------------------------------------------------
Aggregate
-> Index Only Scan using sp_suff_ind on suffix_text_tbl
-> Index Only Scan using sp_radix_ind on radix_text_tbl
Index Cond: (t = 'Worth St '::text)
(3 rows)
SELECT count(*) FROM suffix_text_tbl WHERE t = 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t = 'Worth St ';
count
-------
2
(1 row)
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t >= 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t >= 'Worth St ';
QUERY PLAN
-----------------------------------------------------------------------
Aggregate
-> Index Only Scan using sp_suff_ind on suffix_text_tbl
-> Index Only Scan using sp_radix_ind on radix_text_tbl
Index Cond: (t >= 'Worth St '::text)
(3 rows)
SELECT count(*) FROM suffix_text_tbl WHERE t >= 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t >= 'Worth St ';
count
-------
50
(1 row)
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t ~>=~ 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t ~>=~ 'Worth St ';
QUERY PLAN
-------------------------------------------------------------------------
Aggregate
-> Index Only Scan using sp_suff_ind on suffix_text_tbl
-> Index Only Scan using sp_radix_ind on radix_text_tbl
Index Cond: (t ~>=~ 'Worth St '::text)
(3 rows)
SELECT count(*) FROM suffix_text_tbl WHERE t ~>=~ 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t ~>=~ 'Worth St ';
count
-------
50
(1 row)
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t > 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t > 'Worth St ';
QUERY PLAN
----------------------------------------------------------------------
Aggregate
-> Index Only Scan using sp_suff_ind on suffix_text_tbl
-> Index Only Scan using sp_radix_ind on radix_text_tbl
Index Cond: (t > 'Worth St '::text)
(3 rows)
SELECT count(*) FROM suffix_text_tbl WHERE t > 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t > 'Worth St ';
count
-------
48
(1 row)
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t ~>~ 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t ~>~ 'Worth St ';
QUERY PLAN
------------------------------------------------------------------------
Aggregate
-> Index Only Scan using sp_suff_ind on suffix_text_tbl
-> Index Only Scan using sp_radix_ind on radix_text_tbl
Index Cond: (t ~>~ 'Worth St '::text)
(3 rows)
SELECT count(*) FROM suffix_text_tbl WHERE t ~>~ 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t ~>~ 'Worth St ';
count
-------
48
@ -1459,221 +1459,221 @@ SELECT count(*) FROM kd_point_tbl WHERE p ~= '(4585, 365)';
(1 row)
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t = 'P0123456789abcdef';
SELECT count(*) FROM radix_text_tbl WHERE t = 'P0123456789abcdef';
QUERY PLAN
-----------------------------------------------------------
Aggregate
-> Bitmap Heap Scan on suffix_text_tbl
-> Bitmap Heap Scan on radix_text_tbl
Recheck Cond: (t = 'P0123456789abcdef'::text)
-> Bitmap Index Scan on sp_suff_ind
-> Bitmap Index Scan on sp_radix_ind
Index Cond: (t = 'P0123456789abcdef'::text)
(5 rows)
SELECT count(*) FROM suffix_text_tbl WHERE t = 'P0123456789abcdef';
SELECT count(*) FROM radix_text_tbl WHERE t = 'P0123456789abcdef';
count
-------
1000
(1 row)
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t = 'P0123456789abcde';
SELECT count(*) FROM radix_text_tbl WHERE t = 'P0123456789abcde';
QUERY PLAN
----------------------------------------------------------
Aggregate
-> Bitmap Heap Scan on suffix_text_tbl
-> Bitmap Heap Scan on radix_text_tbl
Recheck Cond: (t = 'P0123456789abcde'::text)
-> Bitmap Index Scan on sp_suff_ind
-> Bitmap Index Scan on sp_radix_ind
Index Cond: (t = 'P0123456789abcde'::text)
(5 rows)
SELECT count(*) FROM suffix_text_tbl WHERE t = 'P0123456789abcde';
SELECT count(*) FROM radix_text_tbl WHERE t = 'P0123456789abcde';
count
-------
1
(1 row)
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t = 'P0123456789abcdefF';
SELECT count(*) FROM radix_text_tbl WHERE t = 'P0123456789abcdefF';
QUERY PLAN
------------------------------------------------------------
Aggregate
-> Bitmap Heap Scan on suffix_text_tbl
-> Bitmap Heap Scan on radix_text_tbl
Recheck Cond: (t = 'P0123456789abcdefF'::text)
-> Bitmap Index Scan on sp_suff_ind
-> Bitmap Index Scan on sp_radix_ind
Index Cond: (t = 'P0123456789abcdefF'::text)
(5 rows)
SELECT count(*) FROM suffix_text_tbl WHERE t = 'P0123456789abcdefF';
SELECT count(*) FROM radix_text_tbl WHERE t = 'P0123456789abcdefF';
count
-------
1
(1 row)
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t < 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t < 'Aztec Ct ';
QUERY PLAN
----------------------------------------------------------------------------
Aggregate
-> Bitmap Heap Scan on suffix_text_tbl
-> Bitmap Heap Scan on radix_text_tbl
Recheck Cond: (t < 'Aztec Ct '::text)
-> Bitmap Index Scan on sp_suff_ind
-> Bitmap Index Scan on sp_radix_ind
Index Cond: (t < 'Aztec Ct '::text)
(5 rows)
SELECT count(*) FROM suffix_text_tbl WHERE t < 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t < 'Aztec Ct ';
count
-------
272
(1 row)
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t ~<~ 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t ~<~ 'Aztec Ct ';
QUERY PLAN
------------------------------------------------------------------------------
Aggregate
-> Bitmap Heap Scan on suffix_text_tbl
-> Bitmap Heap Scan on radix_text_tbl
Recheck Cond: (t ~<~ 'Aztec Ct '::text)
-> Bitmap Index Scan on sp_suff_ind
-> Bitmap Index Scan on sp_radix_ind
Index Cond: (t ~<~ 'Aztec Ct '::text)
(5 rows)
SELECT count(*) FROM suffix_text_tbl WHERE t ~<~ 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t ~<~ 'Aztec Ct ';
count
-------
272
(1 row)
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t <= 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t <= 'Aztec Ct ';
QUERY PLAN
-----------------------------------------------------------------------------
Aggregate
-> Bitmap Heap Scan on suffix_text_tbl
-> Bitmap Heap Scan on radix_text_tbl
Recheck Cond: (t <= 'Aztec Ct '::text)
-> Bitmap Index Scan on sp_suff_ind
-> Bitmap Index Scan on sp_radix_ind
Index Cond: (t <= 'Aztec Ct '::text)
(5 rows)
SELECT count(*) FROM suffix_text_tbl WHERE t <= 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t <= 'Aztec Ct ';
count
-------
273
(1 row)
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t ~<=~ 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t ~<=~ 'Aztec Ct ';
QUERY PLAN
-------------------------------------------------------------------------------
Aggregate
-> Bitmap Heap Scan on suffix_text_tbl
-> Bitmap Heap Scan on radix_text_tbl
Recheck Cond: (t ~<=~ 'Aztec Ct '::text)
-> Bitmap Index Scan on sp_suff_ind
-> Bitmap Index Scan on sp_radix_ind
Index Cond: (t ~<=~ 'Aztec Ct '::text)
(5 rows)
SELECT count(*) FROM suffix_text_tbl WHERE t ~<=~ 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t ~<=~ 'Aztec Ct ';
count
-------
273
(1 row)
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t = 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t = 'Aztec Ct ';
QUERY PLAN
----------------------------------------------------------------------------
Aggregate
-> Bitmap Heap Scan on suffix_text_tbl
-> Bitmap Heap Scan on radix_text_tbl
Recheck Cond: (t = 'Aztec Ct '::text)
-> Bitmap Index Scan on sp_suff_ind
-> Bitmap Index Scan on sp_radix_ind
Index Cond: (t = 'Aztec Ct '::text)
(5 rows)
SELECT count(*) FROM suffix_text_tbl WHERE t = 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t = 'Aztec Ct ';
count
-------
1
(1 row)
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t = 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t = 'Worth St ';
QUERY PLAN
----------------------------------------------------------------------------
Aggregate
-> Bitmap Heap Scan on suffix_text_tbl
-> Bitmap Heap Scan on radix_text_tbl
Recheck Cond: (t = 'Worth St '::text)
-> Bitmap Index Scan on sp_suff_ind
-> Bitmap Index Scan on sp_radix_ind
Index Cond: (t = 'Worth St '::text)
(5 rows)
SELECT count(*) FROM suffix_text_tbl WHERE t = 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t = 'Worth St ';
count
-------
2
(1 row)
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t >= 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t >= 'Worth St ';
QUERY PLAN
-----------------------------------------------------------------------------
Aggregate
-> Bitmap Heap Scan on suffix_text_tbl
-> Bitmap Heap Scan on radix_text_tbl
Recheck Cond: (t >= 'Worth St '::text)
-> Bitmap Index Scan on sp_suff_ind
-> Bitmap Index Scan on sp_radix_ind
Index Cond: (t >= 'Worth St '::text)
(5 rows)
SELECT count(*) FROM suffix_text_tbl WHERE t >= 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t >= 'Worth St ';
count
-------
50
(1 row)
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t ~>=~ 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t ~>=~ 'Worth St ';
QUERY PLAN
-------------------------------------------------------------------------------
Aggregate
-> Bitmap Heap Scan on suffix_text_tbl
-> Bitmap Heap Scan on radix_text_tbl
Recheck Cond: (t ~>=~ 'Worth St '::text)
-> Bitmap Index Scan on sp_suff_ind
-> Bitmap Index Scan on sp_radix_ind
Index Cond: (t ~>=~ 'Worth St '::text)
(5 rows)
SELECT count(*) FROM suffix_text_tbl WHERE t ~>=~ 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t ~>=~ 'Worth St ';
count
-------
50
(1 row)
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t > 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t > 'Worth St ';
QUERY PLAN
----------------------------------------------------------------------------
Aggregate
-> Bitmap Heap Scan on suffix_text_tbl
-> Bitmap Heap Scan on radix_text_tbl
Recheck Cond: (t > 'Worth St '::text)
-> Bitmap Index Scan on sp_suff_ind
-> Bitmap Index Scan on sp_radix_ind
Index Cond: (t > 'Worth St '::text)
(5 rows)
SELECT count(*) FROM suffix_text_tbl WHERE t > 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t > 'Worth St ';
count
-------
48
(1 row)
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t ~>~ 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t ~>~ 'Worth St ';
QUERY PLAN
------------------------------------------------------------------------------
Aggregate
-> Bitmap Heap Scan on suffix_text_tbl
-> Bitmap Heap Scan on radix_text_tbl
Recheck Cond: (t ~>~ 'Worth St '::text)
-> Bitmap Index Scan on sp_suff_ind
-> Bitmap Index Scan on sp_radix_ind
Index Cond: (t ~>~ 'Worth St '::text)
(5 rows)
SELECT count(*) FROM suffix_text_tbl WHERE t ~>~ 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t ~>~ 'Worth St ';
count
-------
48

2
src/test/regress/expected/sanity_check.out
View File

@ -137,6 +137,7 @@ SELECT relname, relhasindex
point_tbl | t
polygon_tbl | t
quad_point_tbl | t
radix_text_tbl | t
ramp | f
real_city | f
reltime_tbl | f
@ -152,7 +153,6 @@ SELECT relname, relhasindex
sql_sizing_profiles | f
stud_emp | f
student | f
suffix_text_tbl | t
tenk1 | t
tenk2 | t
test_range_excl | t

2
src/test/regress/output/misc.source
View File

@ -660,6 +660,7 @@ SELECT user_relns() AS user_relns
point_tbl
polygon_tbl
quad_point_tbl
radix_text_tbl
ramp
random_tbl
real_city
@ -671,7 +672,6 @@ SELECT user_relns() AS user_relns
stud_emp
student
subselect_tbl
suffix_text_tbl
t
tenk1
tenk2

140
src/test/regress/sql/create_index.sql
View File

@ -110,15 +110,15 @@ CREATE TABLE kd_point_tbl AS SELECT * FROM quad_point_tbl;
CREATE INDEX sp_kd_ind ON kd_point_tbl USING spgist (p kd_point_ops);
CREATE TABLE suffix_text_tbl AS
CREATE TABLE radix_text_tbl AS
SELECT name AS t FROM road WHERE name !~ '^[0-9]';
INSERT INTO suffix_text_tbl
INSERT INTO radix_text_tbl
SELECT 'P0123456789abcdef' FROM generate_series(1,1000);
INSERT INTO suffix_text_tbl VALUES ('P0123456789abcde');
INSERT INTO suffix_text_tbl VALUES ('P0123456789abcdefF');
INSERT INTO radix_text_tbl VALUES ('P0123456789abcde');
INSERT INTO radix_text_tbl VALUES ('P0123456789abcdefF');
CREATE INDEX sp_suff_ind ON suffix_text_tbl USING spgist (t);
CREATE INDEX sp_radix_ind ON radix_text_tbl USING spgist (t);
--
-- Test GiST and SP-GiST indexes
@ -194,31 +194,31 @@ SELECT count(*) FROM quad_point_tbl WHERE p >^ '(5000, 4000)';
SELECT count(*) FROM quad_point_tbl WHERE p ~= '(4585, 365)';
SELECT count(*) FROM suffix_text_tbl WHERE t = 'P0123456789abcdef';
SELECT count(*) FROM radix_text_tbl WHERE t = 'P0123456789abcdef';
SELECT count(*) FROM suffix_text_tbl WHERE t = 'P0123456789abcde';
SELECT count(*) FROM radix_text_tbl WHERE t = 'P0123456789abcde';
SELECT count(*) FROM suffix_text_tbl WHERE t = 'P0123456789abcdefF';
SELECT count(*) FROM radix_text_tbl WHERE t = 'P0123456789abcdefF';
SELECT count(*) FROM suffix_text_tbl WHERE t < 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t < 'Aztec Ct ';
SELECT count(*) FROM suffix_text_tbl WHERE t ~<~ 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t ~<~ 'Aztec Ct ';
SELECT count(*) FROM suffix_text_tbl WHERE t <= 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t <= 'Aztec Ct ';
SELECT count(*) FROM suffix_text_tbl WHERE t ~<=~ 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t ~<=~ 'Aztec Ct ';
SELECT count(*) FROM suffix_text_tbl WHERE t = 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t = 'Aztec Ct ';
SELECT count(*) FROM suffix_text_tbl WHERE t = 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t = 'Worth St ';
SELECT count(*) FROM suffix_text_tbl WHERE t >= 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t >= 'Worth St ';
SELECT count(*) FROM suffix_text_tbl WHERE t ~>=~ 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t ~>=~ 'Worth St ';
SELECT count(*) FROM suffix_text_tbl WHERE t > 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t > 'Worth St ';
SELECT count(*) FROM suffix_text_tbl WHERE t ~>~ 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t ~>~ 'Worth St ';
-- Now check the results from plain indexscan
SET enable_seqscan = OFF;
@ -382,56 +382,56 @@ SELECT count(*) FROM kd_point_tbl WHERE p ~= '(4585, 365)';
SELECT count(*) FROM kd_point_tbl WHERE p ~= '(4585, 365)';
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t = 'P0123456789abcdef';
SELECT count(*) FROM suffix_text_tbl WHERE t = 'P0123456789abcdef';
SELECT count(*) FROM radix_text_tbl WHERE t = 'P0123456789abcdef';
SELECT count(*) FROM radix_text_tbl WHERE t = 'P0123456789abcdef';
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t = 'P0123456789abcde';
SELECT count(*) FROM suffix_text_tbl WHERE t = 'P0123456789abcde';
SELECT count(*) FROM radix_text_tbl WHERE t = 'P0123456789abcde';
SELECT count(*) FROM radix_text_tbl WHERE t = 'P0123456789abcde';
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t = 'P0123456789abcdefF';
SELECT count(*) FROM suffix_text_tbl WHERE t = 'P0123456789abcdefF';
SELECT count(*) FROM radix_text_tbl WHERE t = 'P0123456789abcdefF';
SELECT count(*) FROM radix_text_tbl WHERE t = 'P0123456789abcdefF';
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t < 'Aztec Ct ';
SELECT count(*) FROM suffix_text_tbl WHERE t < 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t < 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t < 'Aztec Ct ';
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t ~<~ 'Aztec Ct ';
SELECT count(*) FROM suffix_text_tbl WHERE t ~<~ 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t ~<~ 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t ~<~ 'Aztec Ct ';
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t <= 'Aztec Ct ';
SELECT count(*) FROM suffix_text_tbl WHERE t <= 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t <= 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t <= 'Aztec Ct ';
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t ~<=~ 'Aztec Ct ';
SELECT count(*) FROM suffix_text_tbl WHERE t ~<=~ 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t ~<=~ 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t ~<=~ 'Aztec Ct ';
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t = 'Aztec Ct ';
SELECT count(*) FROM suffix_text_tbl WHERE t = 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t = 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t = 'Aztec Ct ';
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t = 'Worth St ';
SELECT count(*) FROM suffix_text_tbl WHERE t = 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t = 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t = 'Worth St ';
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t >= 'Worth St ';
SELECT count(*) FROM suffix_text_tbl WHERE t >= 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t >= 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t >= 'Worth St ';
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t ~>=~ 'Worth St ';
SELECT count(*) FROM suffix_text_tbl WHERE t ~>=~ 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t ~>=~ 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t ~>=~ 'Worth St ';
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t > 'Worth St ';
SELECT count(*) FROM suffix_text_tbl WHERE t > 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t > 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t > 'Worth St ';
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t ~>~ 'Worth St ';
SELECT count(*) FROM suffix_text_tbl WHERE t ~>~ 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t ~>~ 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t ~>~ 'Worth St ';
-- Now check the results from bitmap indexscan
SET enable_seqscan = OFF;
@ -511,56 +511,56 @@ SELECT count(*) FROM kd_point_tbl WHERE p ~= '(4585, 365)';
SELECT count(*) FROM kd_point_tbl WHERE p ~= '(4585, 365)';
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t = 'P0123456789abcdef';
SELECT count(*) FROM suffix_text_tbl WHERE t = 'P0123456789abcdef';
SELECT count(*) FROM radix_text_tbl WHERE t = 'P0123456789abcdef';
SELECT count(*) FROM radix_text_tbl WHERE t = 'P0123456789abcdef';
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t = 'P0123456789abcde';
SELECT count(*) FROM suffix_text_tbl WHERE t = 'P0123456789abcde';
SELECT count(*) FROM radix_text_tbl WHERE t = 'P0123456789abcde';
SELECT count(*) FROM radix_text_tbl WHERE t = 'P0123456789abcde';
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t = 'P0123456789abcdefF';
SELECT count(*) FROM suffix_text_tbl WHERE t = 'P0123456789abcdefF';
SELECT count(*) FROM radix_text_tbl WHERE t = 'P0123456789abcdefF';
SELECT count(*) FROM radix_text_tbl WHERE t = 'P0123456789abcdefF';
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t < 'Aztec Ct ';
SELECT count(*) FROM suffix_text_tbl WHERE t < 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t < 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t < 'Aztec Ct ';
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t ~<~ 'Aztec Ct ';
SELECT count(*) FROM suffix_text_tbl WHERE t ~<~ 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t ~<~ 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t ~<~ 'Aztec Ct ';
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t <= 'Aztec Ct ';
SELECT count(*) FROM suffix_text_tbl WHERE t <= 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t <= 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t <= 'Aztec Ct ';
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t ~<=~ 'Aztec Ct ';
SELECT count(*) FROM suffix_text_tbl WHERE t ~<=~ 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t ~<=~ 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t ~<=~ 'Aztec Ct ';
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t = 'Aztec Ct ';
SELECT count(*) FROM suffix_text_tbl WHERE t = 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t = 'Aztec Ct ';
SELECT count(*) FROM radix_text_tbl WHERE t = 'Aztec Ct ';
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t = 'Worth St ';
SELECT count(*) FROM suffix_text_tbl WHERE t = 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t = 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t = 'Worth St ';
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t >= 'Worth St ';
SELECT count(*) FROM suffix_text_tbl WHERE t >= 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t >= 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t >= 'Worth St ';
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t ~>=~ 'Worth St ';
SELECT count(*) FROM suffix_text_tbl WHERE t ~>=~ 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t ~>=~ 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t ~>=~ 'Worth St ';
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t > 'Worth St ';
SELECT count(*) FROM suffix_text_tbl WHERE t > 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t > 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t > 'Worth St ';
EXPLAIN (COSTS OFF)
SELECT count(*) FROM suffix_text_tbl WHERE t ~>~ 'Worth St ';
SELECT count(*) FROM suffix_text_tbl WHERE t ~>~ 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t ~>~ 'Worth St ';
SELECT count(*) FROM radix_text_tbl WHERE t ~>~ 'Worth St ';
RESET enable_seqscan;
RESET enable_indexscan;