[jira] [Created] (IGNITE-3716) ODBC: Implement escape sequence parsing.

["Vladimir Ozerov (JIRA)" <ji...@apache.org>]

Vladimir Ozerov created IGNITE-3716:
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             Summary: ODBC: Implement escape sequence parsing.
                 Key: IGNITE-3716
                 URL: https://issues.apache.org/jira/browse/IGNITE-3716
             Project: Ignite
          Issue Type: Task
          Components: odbc
    Affects Versions: 1.7
            Reporter: Vladimir Ozerov
            Assignee: Andrew Mashenkov
            Priority: Critical
             Fix For: 1.8


ODBC standard defines a set of special escape sequences [1] which help to create SQL requests in database-independent format. We need to implement special processor which will accept ODBC string and return parsed SQL query string.

Possible simple stack-based approach:
1) When escape start is found, put it's start position into stack. 
2) If there are no other escapes between start and end - evaluate expression.
3) Finally, replace escape sequence in original string and adjust positions up the stack accordingly.

This way after N replaces we will have fully-escape string.



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