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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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19
src/backend/nodes/copyfuncs.c
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@ -1752,6 +1752,22 @@ _copyMinMaxExpr(const MinMaxExpr *from)
return newnode;
}
/*
* _copySQLValueFunction
*/
static SQLValueFunction *
_copySQLValueFunction(const SQLValueFunction *from)
{
SQLValueFunction *newnode = makeNode(SQLValueFunction);
COPY_SCALAR_FIELD(op);
COPY_SCALAR_FIELD(type);
COPY_SCALAR_FIELD(typmod);
COPY_LOCATION_FIELD(location);
return newnode;
}
/*
* _copyXmlExpr
*/
@ -4525,6 +4541,9 @@ copyObject(const void *from)
case T_MinMaxExpr:
retval = _copyMinMaxExpr(from);
break;
case T_SQLValueFunction:
retval = _copySQLValueFunction(from);
break;
case T_XmlExpr:
retval = _copyXmlExpr(from);
break;