[Bug] Fix partition prune (#4833)

[ccoffline]

Proposed changes

According to @morningman in #4836

We should check if inPredicate.getChild(0) is not a slotRef, do not create partition filter for it.
So it won't goes to the compareLiteral() logic.

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• [] New feature (non-breaking change which adds functionality)
• [] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [] Documentation Update (if none of the other choices apply)
• [] Code refactor (Modify the code structure, format the code, etc...)

Checklist

• [] I have create an issue on (Fix #ISSUE), and have described the bug/feature there in detail
• Compiling and unit tests pass locally with my changes
• [] I have added tests that prove my fix is effective or that my feature works
• [] If this change need a document change, I have updated the document
• [] Any dependent changes have been merged

[ccoffline]

I still don't understand the concept of SlotRef=.=

[morningman]

LGTM

[morningman]

I still don't understand the concept of SlotRef=.=

SlotRef sometimes means a "Column"

[ccoffline]

SlotRef sometimes means a "Column"

thx~