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Add SQL Standard WITH ORDINALITY support for UNNEST (and any other SRF)

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Author: Andrew Gierth, David Fetter
Reviewers: Dean Rasheed, Jeevan Chalke, Stephen Frost
This commit is contained in:
Greg Stark
2013-07-29 16:38:01 +01:00
parent 55cbfa5366
commit c62736cc37
22 changed files with 1486 additions and 323 deletions
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22
src/include/nodes/parsenodes.h
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@@ -471,6 +471,7 @@ typedef struct RangeFunction
{
NodeTag type;
bool lateral; /* does it have LATERAL prefix? */
bool ordinality; /* does it have WITH ORDINALITY suffix? */
Node *funccallnode; /* untransformed function call tree */
Alias *alias; /* table alias & optional column aliases */
List *coldeflist; /* list of ColumnDef nodes to describe result
@@ -651,8 +652,13 @@ typedef struct XmlSerialize
* dropped columns. Note however that a stored rule may have nonempty
* colnames for columns dropped since the rule was created (and for that
* matter the colnames might be out of date due to column renamings).
*
* The same comments apply to FUNCTION RTEs when the function's return type
* is a named composite type.
* is a named composite type. In addition, for all return types, FUNCTION
* RTEs with ORDINALITY must always have the last colname entry being the
* one for the ordinal column; this is enforced when constructing the RTE.
* Thus when ORDINALITY is used, there will be exactly one more colname
* than would have been present otherwise.
*
* In JOIN RTEs, the colnames in both alias and eref are one-to-one with
* joinaliasvars entries. A JOIN RTE will omit columns of its inputs when
@@ -751,15 +757,21 @@ typedef struct RangeTblEntry
/*
* Fields valid for a function RTE (else NULL):
*
* If the function returns RECORD, funccoltypes lists the column types
* declared in the RTE's column type specification, funccoltypmods lists
* their declared typmods, funccolcollations their collations. Otherwise,
* those fields are NIL.
* If the function returns an otherwise-unspecified RECORD, funccoltypes
* lists the column types declared in the RTE's column type specification,
* funccoltypmods lists their declared typmods, funccolcollations their
* collations. Note that in this case, ORDINALITY is not permitted, so
* there is no extra ordinal column to be allowed for.
*
* Otherwise, those fields are NIL, and the result column types must be
* derived from the funcexpr while treating the ordinal column, if
* present, as a special case. (see get_rte_attribute_*)
*/
Node *funcexpr; /* expression tree for func call */
List *funccoltypes; /* OID list of column type OIDs */
List *funccoltypmods; /* integer list of column typmods */
List *funccolcollations; /* OID list of column collation OIDs */
bool funcordinality; /* is this called WITH ORDINALITY? */
/*
* Fields valid for a values RTE (else NIL):