hi,
I'm trying to copy the contents of a bucket of a hash table to a BufFile.
There is a memory context for each bucket. That is, there is an array
(#nbuckets) memory contexts.
thus the tree of mem cxts are
...
hashCxt
|
batchCxt
| |
| |
BucketCxt... BucketCxt
Hi
in the function ExecChooseHashTableSize()
(~/src/backend/executor/nodeHash.c)
are determined the bytes of the hash table. The correspondent code is:
/*
* Target in-memory hashtablesize in SortMem kilobytes
*/
hash_table_bytes = SortMem *1024L
(~/src/include/miscadmin.h)
extern DLLIMPORT
Perhaps you should rebuild the backend with -g (see --enable-debug) so
that gdb can actually be somewhat helpful. It's usually a good idea to
have --enable-cassert turned on when hacking C code, too.
When I rebuilded the backend with --enable-debug and --enable-cassert
the database stops and
Hi
I'm implementing a new join that needs 2 hash tables, one for each relation.
I declared a
new type of node, DPHashJoin (with id T_DPHashJoin 121 at nodes.h) , which
is by now the same as HashJoin
plan node.I created a new plan with two Hash nodes, something that looks
like a symmetric hash
