Commits on Dec 2, 2024

1. [fix](nereids) fix merge_percentile_to_array when has same agg functi… …

   …on (#44783)
   
   Related PR: #34313
   
   Problem Summary
   The original PR did not handle the following scenario:
   ```sql
   SELECT SUM(a), PERCENTILE(pk, 0.1) AS c1, PERCENTILE(pk, 0.1) AS c2, PERCENTILE(pk, 0.4) AS c3 FROM test_merge_percentile;
   ```
   In this case, the aggregate outputs include two identical functions
   (PERCENTILE(pk, 0.1)). When constructing the LogicalProject, a map was
   used where the key is the child of an Alias and the value is the Alias
   itself. However, this approach loses information when two Aliases share
   the same child.
   This PR modifies the map structure to use the child of an Alias as the
   key and a list of Alias objects as the value. This ensures that all
   Alias instances with the same child are preserved, resolving the issue
   of lost information in such cases.

   

   feiniaofeiafei authored and Your Name committed Dec 2, 2024
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