beliefer opened a new pull request #25963: [SPARK-28137][SQL] Add Postgresql function to_number. URL: https://github.com/apache/spark/pull/25963 ### What changes were proposed in this pull request? `Postgresql` and `Oracle` have the function `to_number` to convert a string to number. The implement and support syntax has many different between `Postgresql` and `Oracle`. So, this PR mainly follows the implement of `to_number` in `Postgresql`. This PR references the doc https://www.postgresql.org/docs/12/functions-formatting.html Oracle doc is https://docs.oracle.com/en/database/oracle/oracle-database/19/sqlrf/TO_NUMBER.html#GUID-D4807212-AFD7-48A7-9AED-BEC3E8809866 The syntax like: > select to_number('12,454.8-', '99G999D9S'); -12454.8 ### Why are the changes needed? This PR adds a new function. ### Does this PR introduce any user-facing change? No. ### How was this patch tested? New UT.
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