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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
Download Patch File Download Diff File Expand all files Collapse all files

7
src/backend/nodes/copyfuncs.c
View File

@@ -2175,10 +2175,13 @@ _copyPartitionPruneInfo(const PartitionPruneInfo *from)
COPY_NODE_FIELD(pruning_steps);
COPY_BITMAPSET_FIELD(present_parts);
COPY_SCALAR_FIELD(nparts);
COPY_SCALAR_FIELD(nexprs);
COPY_POINTER_FIELD(subnode_map, from->nparts * sizeof(int));
COPY_POINTER_FIELD(subpart_map, from->nparts * sizeof(int));
COPY_BITMAPSET_FIELD(extparams);
COPY_BITMAPSET_FIELD(execparams);
COPY_POINTER_FIELD(hasexecparam, from->nexprs * sizeof(bool));
COPY_SCALAR_FIELD(do_initial_prune);
COPY_SCALAR_FIELD(do_exec_prune);
COPY_BITMAPSET_FIELD(execparamids);
return newnode;
}

10
src/backend/nodes/outfuncs.c
View File

@@ -1742,6 +1742,7 @@ _outPartitionPruneInfo(StringInfo str, const PartitionPruneInfo *node)
WRITE_NODE_FIELD(pruning_steps);
WRITE_BITMAPSET_FIELD(present_parts);
WRITE_INT_FIELD(nparts);
WRITE_INT_FIELD(nexprs);
appendStringInfoString(str, " :subnode_map");
for (i = 0; i < node->nparts; i++)
@@ -1751,8 +1752,13 @@ _outPartitionPruneInfo(StringInfo str, const PartitionPruneInfo *node)
for (i = 0; i < node->nparts; i++)
appendStringInfo(str, " %d", node->subpart_map[i]);
WRITE_BITMAPSET_FIELD(extparams);
WRITE_BITMAPSET_FIELD(execparams);
appendStringInfoString(str, " :hasexecparam");
for (i = 0; i < node->nexprs; i++)
appendStringInfo(str, " %s", booltostr(node->hasexecparam[i]));
WRITE_BOOL_FIELD(do_initial_prune);
WRITE_BOOL_FIELD(do_exec_prune);
WRITE_BITMAPSET_FIELD(execparamids);
}
/*****************************************************************************

7
src/backend/nodes/readfuncs.c
View File

@@ -1363,10 +1363,13 @@ _readPartitionPruneInfo(void)
READ_NODE_FIELD(pruning_steps);
READ_BITMAPSET_FIELD(present_parts);
READ_INT_FIELD(nparts);
READ_INT_FIELD(nexprs);
READ_INT_ARRAY(subnode_map, local_node->nparts);
READ_INT_ARRAY(subpart_map, local_node->nparts);
READ_BITMAPSET_FIELD(extparams);
READ_BITMAPSET_FIELD(execparams);
READ_BOOL_ARRAY(hasexecparam, local_node->nexprs);
READ_BOOL_FIELD(do_initial_prune);
READ_BOOL_FIELD(do_exec_prune);
READ_BITMAPSET_FIELD(execparamids);
READ_DONE();
}