kevin yu created SPARK-14878:
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Summary: Support Trim characters in the string trim function
Key: SPARK-14878
URL: https://issues.apache.org/jira/browse/SPARK-14878
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 2.0.0
Reporter: kevin yu
The current Spark SQL does not support the trim characters in the string trim
function, which is part of ANSI SQL2003’s standard. For example, IBM DB2 fully
supports it as shown in the
https://www.ibm.com/support/knowledgecenter/SS6NHC/com.ibm.swg.im.dashdb.sql.ref.doc/doc/r0023198.html.
We propose to implement it in this JIRA..
The ANSI SQL2003's trim Syntax:
SQL
<trim function> ::= TRIM <left paren> <trim operands> <right paren>
<trim operands> ::= [ [ <trim specification> ] [ <trim character> ] FROM ]
<trim source>
<trim source> ::= <character value expression>
<trim specification> ::=
LEADING
| TRAILING
| BOTH
<trim character> ::= <character value expression>
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