Hi all,
I found the following new MAL function in the new release of version
11.23.3:
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pattern group.multicolumn(b:bat[:any]...)
(ref:bat[:oid],grp:bat[:oid],hist:bat[:any])
address GROUPmulticolumngroup;
comment Derivation of a group index over multiple columns.
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I thought I may be used by queries with multiple attributes in the GROUP BY
clause.
So I tried to EXPLAIN such a query (e.g., SELECT ... FROM... GROUP BY ColA,
ColB), but it is still compiled with multiple group.subgroup() followed by
a group.subgroupdone().
So, when would this function group.multicolumn() used?
Thanks,
Wenjian
