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Allow omitting one or both boundaries in an array slice specifier.

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Omitted boundaries represent the upper or lower limit of the corresponding
array subscript.  This allows simpler specification of many common
use-cases.

(Revised version of commit 9246af6799)

YUriy Zhuravlev
This commit is contained in:
Tom Lane
2015-12-22 21:05:16 -05:00
parent 0ba3f3bc65
commit 6efbded6e4
15 changed files with 302 additions and 33 deletions
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17
src/include/nodes/parsenodes.h
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@@ -157,9 +157,10 @@ typedef struct Query
List *constraintDeps; /* a list of pg_constraint OIDs that the query
* depends on to be semantically valid */
List *withCheckOptions; /* a list of WithCheckOption's, which are
* only added during rewrite and therefore
* are not written out as part of Query. */
List *withCheckOptions; /* a list of WithCheckOption's, which
* are only added during rewrite and
* therefore are not written out as
* part of Query. */
} Query;
@@ -351,13 +352,17 @@ typedef struct A_Star
} A_Star;
/*
* A_Indices - array subscript or slice bounds ([lidx:uidx] or [uidx])
* A_Indices - array subscript or slice bounds ([idx] or [lidx:uidx])
*
* In slice case, either or both of lidx and uidx can be NULL (omitted).
* In non-slice case, uidx holds the single subscript and lidx is always NULL.
*/
typedef struct A_Indices
{
NodeTag type;
Node *lidx; /* NULL if it's a single subscript */
Node *uidx;
bool is_slice; /* true if slice (i.e., colon present) */
Node *lidx; /* slice lower bound, if any */
Node *uidx; /* subscript, or slice upper bound if any */
} A_Indices;
/*