[branch-2.1](partition) Refine some auto partition behaviours (#32737) #33114
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fix legacy planner grammer
fix nereids planner parsing
fix cases
forbid auto range partition with null column
fix CreateTableStmt with auto partition and some partition items. 1 and 2 are about #31585
doc pr: apache/doris-website#488
Proposed changes
Issue Number: close #xxx
Further comments
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