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https://issues.apache.org/jira/browse/FLINK-10222?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16611643#comment-16611643
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ASF GitHub Bot commented on FLINK-10222:
----------------------------------------
yanghua commented on a change in pull request #6622: [FLINK-10222] [table]
Table scalar function expression parses error when function name equals the
exists keyword suffix
URL: https://github.com/apache/flink/pull/6622#discussion_r216907736
##########
File path:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/expressions/ExpressionParser.scala
##########
@@ -45,6 +45,13 @@ object ExpressionParser extends JavaTokenParsers with
PackratParsers {
("""(?i)\Q""" + kw.key + """\E""").r
}
+ // Convert the keyword into an case insensitive Parser
+ // It uses an exact matching mode. scenes to be used:
+ // a keyword as a suffix no required parameter and not as a prefix
+ def keyword2ParserForSuffixButNotAsPrefix(kw: Keyword): Parser[String] = {
Review comment:
@walterddr I have tried your idea, but some suffix keywords can be used as a
prefix at the same time, and some suffix keywords can take parameters. Applying
this rule to them will cause their test cases to fail.
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> Table scalar function expression parses error when function name equals the
> exists keyword suffix
> -------------------------------------------------------------------------------------------------
>
> Key: FLINK-10222
> URL: https://issues.apache.org/jira/browse/FLINK-10222
> Project: Flink
> Issue Type: Bug
> Components: Table API & SQL
> Reporter: vinoyang
> Priority: Major
> Labels: pull-request-available
>
> Suffix extraction in ExpressionParser.scala does not actually support
> extraction of keywords with the same prefix. For example: Adding suffix
> parsing rules for {{a.fun}} and {{a.function}} simultaneously will causes
> exceptions.
> some discussion :
> [https://github.com/apache/flink/pull/6432#issuecomment-416127815]
> https://github.com/apache/flink/pull/6585#discussion_r212797015
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