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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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1
src/backend/nodes/copyfuncs.c
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@ -2401,6 +2401,7 @@ _copyAIndices(const A_Indices *from)
{
A_Indices *newnode = makeNode(A_Indices);
COPY_SCALAR_FIELD(is_slice);
COPY_NODE_FIELD(lidx);
COPY_NODE_FIELD(uidx);

1
src/backend/nodes/equalfuncs.c
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@ -2151,6 +2151,7 @@ _equalAStar(const A_Star *a, const A_Star *b)
static bool
_equalAIndices(const A_Indices *a, const A_Indices *b)
{
COMPARE_SCALAR_FIELD(is_slice);
COMPARE_NODE_FIELD(lidx);
COMPARE_NODE_FIELD(uidx);

1
src/backend/nodes/outfuncs.c
View File

@ -2763,6 +2763,7 @@ _outA_Indices(StringInfo str, const A_Indices *node)
{
WRITE_NODE_TYPE("A_INDICES");
WRITE_BOOL_FIELD(is_slice);
WRITE_NODE_FIELD(lidx);
WRITE_NODE_FIELD(uidx);
}