database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-06-26 12:21:12 +03:00
Code Activity

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

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

22
src/backend/executor/execQual.c
View File

@ -271,6 +271,8 @@ ExecEvalArrayRef(ArrayRefExprState *astate,
j = 0;
IntArray upper,
lower;
bool upperProvided[MAXDIM],
lowerProvided[MAXDIM];
int *lIndex;
array_source = ExecEvalExpr(astate->refexpr,
@ -300,6 +302,15 @@ ExecEvalArrayRef(ArrayRefExprState *astate,
errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
i + 1, MAXDIM)));
if (eltstate == NULL)
{
/* Slice bound is omitted, so use array's upper bound */
Assert(astate->reflowerindexpr != NIL);
upperProvided[i++] = false;
continue;
}
upperProvided[i] = true;
upper.indx[i++] = DatumGetInt32(ExecEvalExpr(eltstate,
econtext,
&eisnull,
@ -328,6 +339,14 @@ ExecEvalArrayRef(ArrayRefExprState *astate,
errmsg("number of array dimensions (%d) exceeds the maximum allowed (%d)",
j + 1, MAXDIM)));
if (eltstate == NULL)
{
/* Slice bound is omitted, so use array's lower bound */
lowerProvided[j++] = false;
continue;
}
lowerProvided[j] = true;
lower.indx[j++] = DatumGetInt32(ExecEvalExpr(eltstate,
econtext,
&eisnull,
@ -398,6 +417,7 @@ ExecEvalArrayRef(ArrayRefExprState *astate,
econtext->caseValue_datum =
array_get_slice(array_source, i,
upper.indx, lower.indx,
upperProvided, lowerProvided,
astate->refattrlength,
astate->refelemlength,
astate->refelembyval,
@ -456,6 +476,7 @@ ExecEvalArrayRef(ArrayRefExprState *astate,
else
return array_set_slice(array_source, i,
upper.indx, lower.indx,
upperProvided, lowerProvided,
sourceData,
eisnull,
astate->refattrlength,
@ -475,6 +496,7 @@ ExecEvalArrayRef(ArrayRefExprState *astate,
else
return array_get_slice(array_source, i,
upper.indx, lower.indx,
upperProvided, lowerProvided,
astate->refattrlength,
astate->refelemlength,
astate->refelembyval,