[doc](function) Add stack table function documentation - #4059
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#66734) Issue Number: close #66687 Related PR: [apache/doris-website#4059](apache/doris-website#4059) Problem Summary: Add Spark/Hive-compatible stack(num_rows, ...) support with row-major output, NULL padding, column type validation, and recursive constant folding. ### Release note Support Spark/Hive-compatible stack table-generating function semantics. ### Check List (For Author) - Test: FE StackTest 6/6; BE TableFunctionTest.vstack; targeted regression generation and rerun; FE build/checkstyle; BE format/clang-tidy - Behavior changed: Yes (adds stack table function compatibility) - Does this need documentation: Yes ([apache/doris-website#4059](apache/doris-website#4059))
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What problem does this PR solve?
Issue Number: close #66687
Related PR: apache/doris#66734
Problem Summary: Document the Spark/Hive-compatible
stack(num_rows, expr1, ..., exprN)table-generating function in both English and Chinese, including row-major output, NULL padding, constant row-count requirements, type validation, and LATERAL VIEW examples.The documentation is current-only because the linked Doris feature PR targets
masterand has not been released in 4.x.Release note
Document the
stacktable function in English and Chinese.Check List (For Author)