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### What changes were proposed in this pull request? As https://github.com/apache/spark/pull/28534 adds functions from [BigQuery](https://cloud.google.com/bigquery/docs/reference/standard-sql/timestamp_functions) for converting numbers to timestamp, this PR is to add functions UNIX_SECONDS, UNIX_MILLIS and UNIX_MICROS for converting timestamp to numbers. ### Why are the changes needed? 1. Symmetry of the conversion functions 2. Casting timestamp type to numeric types is disallowed in ANSI mode, we should provide functions for users to complete the conversion. ### Does this PR introduce _any_ user-facing change? 3 new functions UNIX_SECONDS, UNIX_MILLIS and UNIX_MICROS for converting timestamp to long type. ### How was this patch tested? Unit tests. Closes #30566 from gengliangwang/timestampLong. Authored-by: Gengliang Wang <gengliang.wang@databricks.com> Signed-off-by: Dongjoon Hyun <dongjoon@apache.org> |
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