beliefer edited a comment on issue #24918: [SPARK-28077][SQL] Support ANSI SQL OVERLAY function. URL: https://github.com/apache/spark/pull/24918#issuecomment-506340129 @ueshin Oracle [doc](https://docs.oracle.com/en/database/oracle/oracle-database/19/arpls/UTL_RAW.html#GUID-342E37E7-FE43-4CE1-A0E9-7DAABD000369) have some description of len `If len is specified, it must be greater than or equal to 0. ` otherwise, throw a error. DB2 [doc](https://www.ibm.com/support/knowledgecenter/SSGMCP_5.3.0/com.ibm.cics.rexx.doc/rexx/overlay.html) have some description of len `If you specify length, it must be a positive whole number or zero. The default value for length is the length of new. ` This is the difference between `PostgreSQL` and `DB2 or Oracle`. So we should follow which way?
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