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Posted to issues@calcite.apache.org by "Forward Xu (JIRA)" <ji...@apache.org> on 2019/05/24 01:50:01 UTC
[jira] [Comment Edited] (CALCITE-3005) Implement string functions:
LEFT, RIGHT
[ https://issues.apache.org/jira/browse/CALCITE-3005?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16847166#comment-16847166 ]
Forward Xu edited comment on CALCITE-3005 at 5/24/19 1:50 AM:
--------------------------------------------------------------
hi [~julianhyde] [~Chunwei Lei] [~pzw2018] Thank you very much.I now found an error when adding JDBC String function `{fn LEFT(string, integer)` and `
{fn RIGHT(string, integer)}
` create in `SqlJdbcFunctionCall` and test in `SqlOperatorBaseTest.testJdbcFn()`.It looks like there's a conflict between String's `LEFT` semantics and `LEFT JOIN` semantics.I am not sure how to solve this problem. Could you give me some advice?
best
qianjin
was (Author: x1q1j1):
hi @julianhyde @chunweilei @pengzhiwei2018 Thank you very much.I now found an error when adding JDBC String function `\{fn LEFT(string, integer)` and `{fn RIGHT(string, integer)}` create in `SqlJdbcFunctionCall` and test in `SqlOperatorBaseTest.testJdbcFn()`.It looks like there's a conflict between String's `LEFT` semantics and `LEFT JOIN` semantics.I am not sure how to solve this problem. Could you give me some advice?
best
qianjin
> Implement string functions: LEFT, RIGHT
> ---------------------------------------
>
> Key: CALCITE-3005
> URL: https://issues.apache.org/jira/browse/CALCITE-3005
> Project: Calcite
> Issue Type: New Feature
> Reporter: Forward Xu
> Assignee: Forward Xu
> Priority: Major
> Labels: pull-request-available
> Time Spent: 6h 10m
> Remaining Estimate: 0h
>
> Some string functions including LEFT, RIGHT are not implemented now. It would be great if these functions can be implemented.
> [{{LEFT(_str_}},_{{len}}_)|https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_left]
> Returns the leftmost _{{len}}_ characters from the string _{{str}}_, or {{NULL}} if any argument is {{NULL}}.
> [{{RIGHT(_str_}},_{{len}}_)|https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_right]
> Returns the rightmost _{{len}}_ characters from the string _{{str}}_, or {{NULL}} if any argument is {{NULL}}.
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