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Add the ability for the core grammar to have more than one parse target.

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This patch essentially allows gram.y to implement a family of related
syntax trees, rather than necessarily always parsing a list of SQL
statements.  raw_parser() gains a new argument, enum RawParseMode,
to say what to do.  As proof of concept, add a mode that just parses
a TypeName without any other decoration, and use that to greatly
simplify typeStringToTypeName().

In addition, invent a new SPI entry point SPI_prepare_extended() to
allow SPI users (particularly plpgsql) to get at this new functionality.
In hopes of making this the last variant of SPI_prepare(), set up its
additional arguments as a struct rather than direct arguments, and
promise that future additions to the struct can default to zero.
SPI_prepare_cursor() and SPI_prepare_params() can perhaps go away at
some point.

Discussion: https://postgr.es/m/4165684.1607707277@sss.pgh.pa.us
This commit is contained in:
Tom Lane
2021-01-04 11:03:22 -05:00
parent b49154b3b7
commit 844fe9f159
14 changed files with 268 additions and 83 deletions
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5
src/backend/parser/parse_coerce.c
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@@ -1541,7 +1541,7 @@ select_common_typmod(ParseState *pstate, List *exprs, Oid common_type)
foreach(lc, exprs)
{
Node *expr = (Node *) lfirst(lc);
Node *expr = (Node *) lfirst(lc);
/* Types must match */
if (exprType(expr) != common_type)
@@ -2380,7 +2380,8 @@ enforce_generic_type_consistency(const Oid *actual_arg_types,
if (!OidIsValid(elem_typeid))
{
/*
* if we don't have an element type yet, use the one we just got
* if we don't have an element type yet, use the one we just
* got
*/
elem_typeid = range_typelem;
}