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Track in the plan the types associated with PARAM_EXEC parameters.

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Up until now, we only tracked the number of parameters, which was
sufficient to allocate an array of Datums of the appropriate size,
but not sufficient to, for example, know how to serialize a Datum
stored in one of those slots.  An upcoming patch wants to do that,
so add this tracking to make it possible.

Patch by me, reviewed by Tom Lane and Amit Kapila.

Discussion: http://postgr.es/m/CA+TgmoYqpxDKn8koHdW8BEKk8FMUL0=e8m2Qe=M+r0UBjr3tuQ@mail.gmail.com
This commit is contained in:
Robert Haas
2017-11-13 15:24:12 -05:00
parent ce4c86a656
commit e64861c79b
10 changed files with 53 additions and 28 deletions
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6
src/include/nodes/relation.h
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@@ -114,7 +114,7 @@ typedef struct PlannerGlobal
List *invalItems; /* other dependencies, as PlanInvalItems */
int nParamExec; /* number of PARAM_EXEC Params used */
List *paramExecTypes; /* type OIDs for PARAM_EXEC Params */
Index lastPHId; /* highest PlaceHolderVar ID assigned */
@@ -2219,8 +2219,8 @@ typedef struct MinMaxAggInfo
* from subplans (values that are setParam items for those subplans). These
* IDs need not be tracked via PlannerParamItems, since we do not need any
* duplicate-elimination nor later processing of the represented expressions.
* Instead, we just record the assignment of the slot number by incrementing
* root->glob->nParamExec.
* Instead, we just record the assignment of the slot number by appending to
* root->glob->paramExecTypes.
*/
typedef struct PlannerParamItem
{