Karl-WangSK opened a new pull request #29360:
URL: https://github.com/apache/spark/pull/29360
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### What changes were proposed in this pull request?
This pr adds a batch in Optimizer for multidimensional analysis sql
### Why are the changes needed?
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Split an expand into several smallExpand,which contains the Specified number
of projections.
For instance,like this sql.select a,b,c,d,count(1) from table1 group by
a,b,c,d with cube. It can expand 2^4 times of original data size.
Now we specify the spark.sql.optimizer.projections.size=4.The Expand will be
split into 2^4/4 smallExpand.It can reduce the shuffle pressure and improve
performance in multidimensional analysis when data is huge.
### Does this PR introduce _any_ user-facing change?
no
### How was this patch tested?
unit test
Authored-by: Karl-WangSK <[email protected]>
Signed-off-by: Karl-WangSK <[email protected]>
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