GitHub user buptljy opened a pull request:

    https://github.com/apache/flink/pull/5618

    [FLINK-6895][table]Add STR_TO_DATE supported in SQL

    ## What is the purpose of the change
    Add STR_TO_DATE Function supported in SQL
    ## Brief change log
     * STR_TO_DATE(str string, format string)  
        \-  str is the string that need to be transformed.
        \- format is the pattern of "str"
     * Add tests in ScalarFunctionsTest.scala
     * Add docs in sql.md
    ## Verifying this change
     * Run unit tests in  ScalarFunctionsTest.scala
    ## Does this pull request potentially affect one of the following parts:
     * A new sql function
    ## Documentation
      * Add docs in sql.md

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/buptljy/flink str_to_date

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/flink/pull/5618.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #5618
    
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commit 59752143ee438cb11969ae4bdda1fac5fc32813c
Author: Liao Jiayi <liaojiayi@...>
Date:   2018-03-01T11:58:08Z

    add str_to_date sql function

commit 63f71e4b3d6378f2114aa04ba4d1128f1ec3bc38
Author: Liao Jiayi <liaojiayi@...>
Date:   2018-03-01T11:58:41Z

    Merge branch 'master' of github.com:apache/flink

commit 3ec6d2ec487151928032d144de94ca9113d63f01
Author: Liao Jiayi <liaojiayi@...>
Date:   2018-03-01T15:30:04Z

    fix checkstyle error

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