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Support [NO] INDENT option in XMLSERIALIZE().

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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
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src/backend/parser/parse_expr.c
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@ -2331,6 +2331,7 @@ transformXmlSerialize(ParseState *pstate, XmlSerialize *xs)
typenameTypeIdAndMod(pstate, xs->typeName, &targetType, &targetTypmod);
xexpr->xmloption = xs->xmloption;
xexpr->indent = xs->indent;
xexpr->location = xs->location;
/* We actually only need these to be able to parse back the expression. */
xexpr->type = targetType;