When would the function group.multicolumn() used?
3 Aug
2016
3 Aug
'16
8:11 a.m.
Hi all,
I found the following new MAL function in the new release of version 11.23.3:
============================================================ 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. ============================================================
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
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Xu,Wenjian