[SPARK-20964] Make some keywords reserved along with the ANSI/SQL standard

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.1.1
• Fix Version/s: 3.0.0
• Component/s: SQL
• Assignee: Takeshi Yamamuro
• Reporter: Takeshi Yamamuro
• Created: 02/Jun/17 07:19
• Updated: 05/Feb/20 08:25
• Resolved: 05/Feb/20 06:16

Description

The current Spark has many non-reserved words that are essentially reserved in the ANSI/SQL standard (http://developer.mimer.se/validator/sql-reserved-words.tml).
https://github.com/apache/spark/blob/master/sql/catalyst/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBase.g4#L709

This is because there are many datasources (for instance twitter4j) that unfortunately use reserved keywords for column names (See hvanhovell's comments: https://github.com/apache/spark/pull/18079#discussion_r118842186). We might fix this issue in future major releases.

Issue Links

• is related to: SPARK-26215 define reserved keywords after SQL standard
• relates to: SPARK-26215 define reserved keywords after SQL standard