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Commit 0f1015ff authored by Wenchen Fan's avatar Wenchen Fan Committed by Cheng Lian
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[SPARK-14001][SQL] support multi-children Union in SQLBuilder 

## What changes were proposed in this pull request?

The fix is simple, use the existing `CombineUnions` rule to combine adjacent Unions before build SQL string.

## How was this patch tested?

The re-enabled test

Author: Wenchen Fan <wenchen@databricks.com>

Closes #11818 from cloud-fan/bug-fix.
parent 7783b6f3
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