database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-07-30 11:03:19 +03:00
Code Activity

Add Oracle-compatible GREATEST and LEAST functions. Pavel Stehule

Browse Source
This commit is contained in:
Tom Lane
2005-06-26 22:05:42 +00:00
parent d395aecffa
commit 943b396245
17 changed files with 409 additions and 36 deletions
Download Patch File Download Diff File Expand all files Collapse all files

33
src/backend/utils/adt/ruleutils.c
View File

@ -3,7 +3,7 @@
* back to source text
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/ruleutils.c,v 1.200 2005/06/05 00:38:10 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/ruleutils.c,v 1.201 2005/06/26 22:05:40 tgl Exp $
*
* This software is copyrighted by Jan Wieck - Hamburg.
*
@ -2781,6 +2781,7 @@ isSimpleNode(Node *node, Node *parentNode, int prettyFlags)
case T_ArrayExpr:
case T_RowExpr:
case T_CoalesceExpr:
case T_MinMaxExpr:
case T_NullIfExpr:
case T_Aggref:
case T_FuncExpr:
@ -2886,10 +2887,11 @@ isSimpleNode(Node *node, Node *parentNode, int prettyFlags)
case T_BoolExpr: /* lower precedence */
case T_ArrayRef: /* other separators */
case T_ArrayExpr: /* other separators */
case T_RowExpr: /* other separators */
case T_RowExpr: /* other separators */
case T_CoalesceExpr: /* own parentheses */
case T_MinMaxExpr: /* own parentheses */
case T_NullIfExpr: /* other separators */
case T_Aggref: /* own parentheses */
case T_Aggref: /* own parentheses */
case T_CaseExpr: /* other separators */
return true;
default:
@ -2933,10 +2935,11 @@ isSimpleNode(Node *node, Node *parentNode, int prettyFlags)
}
case T_ArrayRef: /* other separators */
case T_ArrayExpr: /* other separators */
case T_RowExpr: /* other separators */
case T_RowExpr: /* other separators */
case T_CoalesceExpr: /* own parentheses */
case T_MinMaxExpr: /* own parentheses */
case T_NullIfExpr: /* other separators */
case T_Aggref: /* own parentheses */
case T_Aggref: /* own parentheses */
case T_CaseExpr: /* other separators */
return true;
default:
@ -3491,6 +3494,24 @@ get_rule_expr(Node *node, deparse_context *context,
}
break;
case T_MinMaxExpr:
{
MinMaxExpr *minmaxexpr = (MinMaxExpr *) node;
switch (minmaxexpr->op)
{
case IS_GREATEST:
appendStringInfo(buf, "GREATEST(");
break;
case IS_LEAST:
appendStringInfo(buf, "LEAST(");
break;
}
get_rule_expr((Node *) minmaxexpr->args, context, true);
appendStringInfoChar(buf, ')');
}
break;
case T_NullIfExpr:
{
NullIfExpr *nullifexpr = (NullIfExpr *) node;
@ -4109,7 +4130,7 @@ get_from_clause_item(Node *jtnode, Query *query, deparse_context *context)
bool need_paren_on_right;
need_paren_on_right = PRETTY_PAREN(context) &&
!IsA(j->rarg, RangeTblRef) &&
!IsA(j->rarg, RangeTblRef) &&
!(IsA(j->rarg, JoinExpr) && ((JoinExpr*) j->rarg)->alias != NULL);
if (!PRETTY_PAREN(context) || j->alias != NULL)