Implement user defined planner for date_part #11220
Description
Is your feature request related to a problem or challenge?
As discussed in #11207 The idea is to move hardcoded the date_part operator to function in the parser step, which is currently handled in the optimizer step. We need to implement user-defined parser mechanisms to enable more flexible SQL planning.
Describe the solution you'd like
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Describe alternatives you've considered
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Additional context
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