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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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2
src/backend/utils/adt/ruleutils.c
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@ -9372,10 +9372,12 @@ printSubscripts(ArrayRef *aref, deparse_context *context)
appendStringInfoChar(buf, '[');
if (lowlist_item)
{
/* If subexpression is NULL, get_rule_expr prints nothing */
get_rule_expr((Node *) lfirst(lowlist_item), context, false);
appendStringInfoChar(buf, ':');
lowlist_item = lnext(lowlist_item);
}
/* If subexpression is NULL, get_rule_expr prints nothing */
get_rule_expr((Node *) lfirst(uplist_item), context, false);
appendStringInfoChar(buf, ']');
}