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Improve parsetree representation of special functions such as CURRENT_DATE.

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We implement a dozen or so parameterless functions that the SQL standard
defines special syntax for.  Up to now, that was done by converting them
into more or less ad-hoc constructs such as "'now'::text::date".  That's
messy for multiple reasons: it exposes what should be implementation
details to users, and performance is worse than it needs to be in several
cases.  To improve matters, invent a new expression node type
SQLValueFunction that can represent any of these parameterless functions.

Bump catversion because this changes stored parsetrees for rules.

Discussion: <30058.1463091294@sss.pgh.pa.us>
This commit is contained in:
Tom Lane
2016-08-16 20:33:01 -04:00
parent 4bc4cfe3bd
commit 0bb51aa967
24 changed files with 626 additions and 168 deletions
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14
src/backend/nodes/outfuncs.c
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@ -1423,6 +1423,17 @@ _outMinMaxExpr(StringInfo str, const MinMaxExpr *node)
WRITE_LOCATION_FIELD(location);
}
static void
_outSQLValueFunction(StringInfo str, const SQLValueFunction *node)
{
WRITE_NODE_TYPE("SQLVALUEFUNCTION");
WRITE_ENUM_FIELD(op, SQLValueFunctionOp);
WRITE_OID_FIELD(type);
WRITE_INT_FIELD(typmod);
WRITE_LOCATION_FIELD(location);
}
static void
_outXmlExpr(StringInfo str, const XmlExpr *node)
{
@ -3522,6 +3533,9 @@ outNode(StringInfo str, const void *obj)
case T_MinMaxExpr:
_outMinMaxExpr(str, obj);
break;
case T_SQLValueFunction:
_outSQLValueFunction(str, obj);
break;
case T_XmlExpr:
_outXmlExpr(str, obj);
break;