Support window Function lead/lag #5671
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What problem does this PR solve?
Issue Number: close #5579
tidb pr: pingcap/tidb#37366
Problem Summary:
What is changed and how it works?
DAGExpressionAnalyzer::appendWindowColumnsand addbuildLeadLagto handle the type cast of the first and third arguments oflead/lagfillArgColumnNumbersto get the index of the window function's argument in the blockWindowFrame::BoundaryType::Unbounded, and make the default frame to[start: Unbounded, end:Unbounded], consistent with tidb, https://github.com/pingcap/tidb/blob/a89ef1f27660f1d60fb5067fd475696f21abc1b0/executor/builder.go#L4480-L4488lead/lagCheck List
Tests
Side effects
Documentation
Release note