[
https://issues.apache.org/jira/browse/FLINK-9970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16593233#comment-16593233
]
ASF GitHub Bot commented on FLINK-9970:
---------------------------------------
yanghua commented on issue #6432: [FLINK-9970] [table] Add ASCII/CHR function
for table/sql API
URL: https://github.com/apache/flink/pull/6432#issuecomment-416127815
@fhueske I fix this issue by replacing :
```
composite <~ "." ~ ASC ~ opt("()") ^^ { e => Asc(e) }
```
to
```
composite <~ "." ~ ("""(?i)^asc$""").r ~ opt("()") ^^ { e => Asc(e) }
```
My test cases and SortStringExpressionTest can be tested successfully.
When I test the function name starting with desc (`"f0.descbb()"`), the same
exception is reported:
```
org.apache.flink.table.api.ExpressionParserException: Could not parse
expression at column 8: string matching regex `(?i)\Qas\E' expected but `b'
found
f0.descbb()
^
at
org.apache.flink.table.expressions.ExpressionParser$.throwError(ExpressionParser.scala:549)
at
org.apache.flink.table.expressions.ExpressionParser$.parseExpression(ExpressionParser.scala:542)
at
org.apache.flink.table.expressions.utils.ExpressionTestBase.addTableApiTestExpr(ExpressionTestBase.scala:255)
at
org.apache.flink.table.expressions.utils.ExpressionTestBase.testTableApi(ExpressionTestBase.scala:275)
at
org.apache.flink.table.expressions.ScalarFunctionsTest.testAscii(ScalarFunctionsTest.scala:549)
```
In theory, the scalar function names added later have the same possibility
of prefixes. I think we should use an exact match mode for suffix.
cc @twalthr @walterddr
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> Add ASCII/CHR function for table/sql API
> ----------------------------------------
>
> Key: FLINK-9970
> URL: https://issues.apache.org/jira/browse/FLINK-9970
> Project: Flink
> Issue Type: Sub-task
> Components: Table API & SQL
> Reporter: vinoyang
> Assignee: vinoyang
> Priority: Minor
> Labels: pull-request-available
>
> for ASCII function :
> refer to :
> [https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_ascii]
> for CHR function :
> This function convert ASCII code to a character,
> refer to : [https://doc.ispirer.com/sqlways/Output/SQLWays-1-071.html]
> Considering "CHAR" always is a keyword in many database, so we use "CHR"
> keyword.
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