yaooqinn opened a new pull request #26371: [SPARK-27976][SQL] Add built-in Array Functions: array_append URL: https://github.com/apache/spark/pull/26371 ### What changes were proposed in this pull request? Function | Return Type | Description | Example | Result -- | -- | -- | -- | -- array_append(anyarray,anyelement) | anyarray | append an element to the end of an array | array_append(ARRAY[1,2], 3) | {{ {1,2,3}}} ### Why are the changes needed? https://www.postgresql.org/docs/current/functions-array.html Other DBs: https://phoenix.apache.org/language/functions.html#array_append https://docs.teradata.com/reader/kmuOwjp1zEYg98JsB8fu_A/68fdFR3LWhx7KtHc9Iv5Qg ### Does this PR introduce any user-facing change? yes. add a new array function array_append ### How was this patch tested? <!-- If tests were added, say they were added here. Please make sure to add some test cases that check the changes thoroughly including negative and positive cases if possible. If it was tested in a way different from regular unit tests, please clarify how you tested step by step, ideally copy and paste-able, so that other reviewers can test and check, and descendants can verify in the future. If tests were not added, please describe why they were not added and/or why it was difficult to add. --> add uts
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