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Reimplement LIKE/ESCAPE as operators so that indexscan optimization

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can still work, per recent discussion on pghackers.  Correct some bugs
in ILIKE implementation.
This commit is contained in:
Tom Lane
2000-09-15 18:45:31 +00:00
parent 148f905f41
commit 8ae9ad1cb8
9 changed files with 511 additions and 514 deletions
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42
src/backend/optimizer/path/indxpath.c
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@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/path/indxpath.c,v 1.95 2000/09/12 21:06:53 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/path/indxpath.c,v 1.96 2000/09/15 18:45:25 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1755,6 +1755,20 @@ match_special_index_operator(Expr *clause, Oid opclass, Oid relam,
pfree(patt);
break;
case OID_TEXT_ICLIKE_OP:
case OID_BPCHAR_ICLIKE_OP:
case OID_VARCHAR_ICLIKE_OP:
case OID_NAME_ICLIKE_OP:
/* the right-hand const is type text for all of these */
patt = DatumGetCString(DirectFunctionCall1(textout,
constvalue));
isIndexable = pattern_fixed_prefix(patt, Pattern_Type_Like_IC,
&prefix, &rest) != Pattern_Prefix_None;
if (prefix)
pfree(prefix);
pfree(patt);
break;
case OID_TEXT_REGEXEQ_OP:
case OID_BPCHAR_REGEXEQ_OP:
case OID_VARCHAR_REGEXEQ_OP:
@ -1797,6 +1811,7 @@ match_special_index_operator(Expr *clause, Oid opclass, Oid relam,
switch (expr_op)
{
case OID_TEXT_LIKE_OP:
case OID_TEXT_ICLIKE_OP:
case OID_TEXT_REGEXEQ_OP:
case OID_TEXT_ICREGEXEQ_OP:
if (!op_class(find_operator(">=", TEXTOID), opclass, relam) ||
@ -1805,6 +1820,7 @@ match_special_index_operator(Expr *clause, Oid opclass, Oid relam,
break;
case OID_BPCHAR_LIKE_OP:
case OID_BPCHAR_ICLIKE_OP:
case OID_BPCHAR_REGEXEQ_OP:
case OID_BPCHAR_ICREGEXEQ_OP:
if (!op_class(find_operator(">=", BPCHAROID), opclass, relam) ||
@ -1813,6 +1829,7 @@ match_special_index_operator(Expr *clause, Oid opclass, Oid relam,
break;
case OID_VARCHAR_LIKE_OP:
case OID_VARCHAR_ICLIKE_OP:
case OID_VARCHAR_REGEXEQ_OP:
case OID_VARCHAR_ICREGEXEQ_OP:
if (!op_class(find_operator(">=", VARCHAROID), opclass, relam) ||
@ -1821,6 +1838,7 @@ match_special_index_operator(Expr *clause, Oid opclass, Oid relam,
break;
case OID_NAME_LIKE_OP:
case OID_NAME_ICLIKE_OP:
case OID_NAME_REGEXEQ_OP:
case OID_NAME_ICREGEXEQ_OP:
if (!op_class(find_operator(">=", NAMEOID), opclass, relam) ||
@ -1887,6 +1905,24 @@ expand_indexqual_conditions(List *indexquals)
pfree(patt);
break;
case OID_TEXT_ICLIKE_OP:
case OID_BPCHAR_ICLIKE_OP:
case OID_VARCHAR_ICLIKE_OP:
case OID_NAME_ICLIKE_OP:
/* the right-hand const is type text for all of these */
constvalue = ((Const *) rightop)->constvalue;
patt = DatumGetCString(DirectFunctionCall1(textout,
constvalue));
pstatus = pattern_fixed_prefix(patt, Pattern_Type_Like_IC,
&prefix, &rest);
resultquals = nconc(resultquals,
prefix_quals(leftop, expr_op,
prefix, pstatus));
if (prefix)
pfree(prefix);
pfree(patt);
break;
case OID_TEXT_REGEXEQ_OP:
case OID_BPCHAR_REGEXEQ_OP:
case OID_VARCHAR_REGEXEQ_OP:
@ -1955,24 +1991,28 @@ prefix_quals(Var *leftop, Oid expr_op,
switch (expr_op)
{
case OID_TEXT_LIKE_OP:
case OID_TEXT_ICLIKE_OP:
case OID_TEXT_REGEXEQ_OP:
case OID_TEXT_ICREGEXEQ_OP:
datatype = TEXTOID;
break;
case OID_BPCHAR_LIKE_OP:
case OID_BPCHAR_ICLIKE_OP:
case OID_BPCHAR_REGEXEQ_OP:
case OID_BPCHAR_ICREGEXEQ_OP:
datatype = BPCHAROID;
break;
case OID_VARCHAR_LIKE_OP:
case OID_VARCHAR_ICLIKE_OP:
case OID_VARCHAR_REGEXEQ_OP:
case OID_VARCHAR_ICREGEXEQ_OP:
datatype = VARCHAROID;
break;
case OID_NAME_LIKE_OP:
case OID_NAME_ICLIKE_OP:
case OID_NAME_REGEXEQ_OP:
case OID_NAME_ICREGEXEQ_OP:
datatype = NAMEOID;