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Support [NO] INDENT option in XMLSERIALIZE().

This adds the ability to pretty-print XML documents ... according to
libxml's somewhat idiosyncratic notions of what's pretty, anyway.
One notable divergence from a strict reading of the spec is that
libxml is willing to collapse empty nodes "<node></node>" to just
"<node/>", whereas SQL and the underlying XML spec say that this
option should only result in whitespace tweaks.  Nonetheless,
it seems close enough to justify using the SQL-standard syntax.

Jim Jones, reviewed by Peter Smith and myself

Discussion: https://postgr.es/m/2f5df461-dad8-6d7d-4568-08e10608a69b@uni-muenster.de
This commit is contained in:
Tom Lane
2023-03-15 16:58:59 -04:00
parent 419a8dd814
commit 483bdb2afe
15 changed files with 775 additions and 22 deletions

View File

@ -3837,8 +3837,10 @@ ExecEvalXmlExpr(ExprState *state, ExprEvalStep *op)
return;
value = argvalue[0];
*op->resvalue = PointerGetDatum(xmltotext_with_xmloption(DatumGetXmlP(value),
xexpr->xmloption));
*op->resvalue =
PointerGetDatum(xmltotext_with_options(DatumGetXmlP(value),
xexpr->xmloption,
xexpr->indent));
*op->resnull = false;
}
break;