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Simplify CitusNewNode (#7434) 

postgres refactored newNode() in PG 17, the main point for doing this is
the original tricks is no longer neccessary for modern compilers[1].

This does the same for Citus.

This should have no backward compatibility issues since it just replaces
palloc0fast with palloc0.

This is good for forward compatibility since palloc0fast no longer
exists in PG 17.

[1]
https://www.postgresql.org/message-id/b51f1fa7-7e6a-4ecc-936d-90a8a1659e7c@iki.fi
pull/7427/head^2
zhjwpku 2024-01-22 21:55:14 +08:00 committed by GitHub
parent 14ecebe47c
commit 4b295cc857
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1 changed files with 11 additions and 28 deletions
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39
src/include/distributed/citus_nodes.h
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@ -92,38 +92,21 @@ CitusNodeTagI(Node *node)
return ((CitusNode*)(node))->citus_tag;
}
/*
* Postgres's nodes/nodes.h has more information on why we do this.
*/
#ifdef __GNUC__
/* Citus variant of newNode(), don't use directly. */
#define CitusNewNode(size, tag) \
({ CitusNode *_result; \
AssertMacro((size) >= sizeof(CitusNode)); /* need the tag, at least */ \
_result = (CitusNode *) palloc0fast(size); \
_result->extensible.type = T_ExtensibleNode; \
_result->extensible.extnodename = CitusNodeTagNames[tag - CITUS_NODE_TAG_START]; \
_result->citus_tag =(int) (tag); \
_result; \
})
static inline CitusNode *
CitusNewNode(size_t size, CitusNodeTag tag)
{
CitusNode *result;
#else
extern CitusNode *newCitusNodeMacroHolder;
#define CitusNewNode(size, tag) \
( \
AssertMacro((size) >= sizeof(CitusNode)), /* need the tag, at least */ \
newCitusNodeMacroHolder = (CitusNode *) palloc0fast(size), \
newCitusNodeMacroHolder->extensible.type = T_ExtensibleNode, \
newCitusNodeMacroHolder->extensible.extnodename = CitusNodeTagNames[tag - CITUS_NODE_TAG_START], \
newCitusNodeMacroHolder->citus_tag =(int) (tag), \
newCitusNodeMacroHolder \
)
#endif
Assert(size >= sizeof(CitusNode)); /* need the ExtensibleNode and the tag, at least */
result = (CitusNode *) palloc0(size);
result->extensible.type = T_ExtensibleNode;
result->extensible.extnodename = CitusNodeTagNames[tag - CITUS_NODE_TAG_START];
result->citus_tag = (int) (tag);
return result;
}
/*
* IsA equivalent that compares node tags, including Citus-specific nodes.