planner: fix the panic when the argument of agg func is scalarfunction in apply (#20485) #20487
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Signed-off-by: ti-srebot <ti-srebot@pingcap.com>
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cherry-pick #20485 to release-4.0
What problem does this PR solve?
Issue Number: #19504
Problem Summary:
What is changed and how it works?
What's Changed:
The argument of the aggregation function might be a scalar function or constant. We need to do type asserting for them.
How it Works:
Related changes
Check List
Tests
Side effects
N/A
Release note