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Improve run-time partition pruning to handle any stable expression.

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The initial coding of the run-time-pruning feature only coped with cases
where the partition key(s) are compared to Params.  That is a bit silly;
we can allow it to work with any non-Var-containing stable expression, as
long as we take special care with expressions containing PARAM_EXEC Params.
The code is hardly any longer this way, and it's considerably clearer
(IMO at least).  Per gripe from Pavel Stehule.

David Rowley, whacked around a bit by me

Discussion: https://postgr.es/m/CAFj8pRBjrufA3ocDm8o4LPGNye9Y+pm1b9kCwode4X04CULG3g@mail.gmail.com
This commit is contained in:
Tom Lane
2018-06-10 15:22:25 -04:00
parent c83e202990
commit 73b7f48f78
11 changed files with 461 additions and 271 deletions
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20
src/include/partitioning/partprune.h
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@ -40,23 +40,27 @@ typedef struct PartitionPruneContext
PartitionBoundInfo boundinfo;
/*
* Can be set when the context is used from the executor to allow params
* found matching the partition key to be evaluated.
* This will be set when the context is used from the executor, to allow
* Params to be evaluated.
*/
PlanState *planstate;
/*
* Parameters that are safe to be used for partition pruning. execparams
* are not safe to use until the executor is running.
*/
Bitmapset *safeparams;
/*
* Array of ExprStates, indexed as per PruneCtxStateIdx; one for each
* partkey in each pruning step. Allocated if planstate is non-NULL,
* otherwise NULL.
*/
ExprState **exprstates;
/*
* Similar array of flags, each true if corresponding 'exprstate'
* expression contains any PARAM_EXEC Params. (Can be NULL if planstate
* is NULL.)
*/
bool *exprhasexecparam;
/* true if it's safe to evaluate PARAM_EXEC Params */
bool evalexecparams;
} PartitionPruneContext;
#define PruneCxtStateIdx(partnatts, step_id, keyno) \