gatorsmile commented on issue #23259: [SPARK-26215][SQL] Define reserved/non-reserved keywords based on the ANSI SQL standard URL: https://github.com/apache/spark/pull/23259#issuecomment-464405413 > NOTE: This pr only added a small set of keywords as reserved ones and these keywords are reserved in all the ANSI SQL standards (SQL-92, SQL-99, SQL-2003, SQL-2008, SQL-2011, and SQL-2016) and PostgreSQL. This is because there is room to discuss which keyword should be reserved or not, .e.g., interval units (day, hour, minute, second, ...) are reserved in the ANSI SQL standards though, they are not reserved in PostgreSQL. Therefore, we need more researches about the other database-like systems (e.g., Oracle Databases, DB2, SQL server) in follow-up activities. Yeah. We need to revisit it after merging this PR. Thus, https://issues.apache.org/jira/browse/SPARK-26905 is created for revisiting the list before the release.
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