[jira] [Assigned] (IGNITE-19341) SQL: SUBSTRING function does not support NULL values (try 2)

["Andrey Mashenkov (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-19341?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrey Mashenkov reassigned IGNITE-19341:
-----------------------------------------

    Assignee:     (was: Andrey Mashenkov)

> SQL: SUBSTRING function does not support NULL values (try 2)
> ------------------------------------------------------------
>
>                 Key: IGNITE-19341
>                 URL: https://issues.apache.org/jira/browse/IGNITE-19341
>             Project: Ignite
>          Issue Type: Bug
>          Components: sql
>    Affects Versions: 3.0.0-beta1
>            Reporter: Andrey Khitrin
>            Priority: Major
>              Labels: calcite2-required, ignite-3, sql
>
> ANSI99 SQL specification ("6.18 <string value function>") says the following:
> {code:java}
> 3) If <character substring function> is specified, then:
>   a) Let C be the value of the <character value expression>, ..., and let S be the value of the <start position>.
>   b) If <string length> is specified, then let L be the value of <string length> ...
>   c) If either C, S, or L is the null value, then the result of the <character substring function> is the null value.
> {code}
> So, we should expect the following behavior:
> {code:sql}
> SUBSTRING('text' FROM 1 FOR NULL) -> NULL
> SUBSTRING('text' FROM NULL FOR 2) -> NULL
> SUBSTRING(NULL FROM 1 FOR 2) -> NULL
> {code}
> Instead, we got errors for these queries:
> {code:sql}
> sql-cli> SELECT SUBSTRING('text' FROM 1 FOR NULL);
> SQL query execution error
> Exception while executing query [query=SELECT SUBSTRING('text' FROM 1 FOR NULL);]. Error message:From line 1, column 8
> to line 1, column 40: Cannot apply 'SUBSTRING' to arguments of type 'SUBSTRING(<CHAR(4)> FROM <INTEGER> FOR <NULL>)'. Supported form(s): 'SUBSTRING(<CHAR> FROM <INTEGER>)'
> 'SUBSTRING(<CHAR> FROM <INTEGER> FOR <INTEGER>)'
> 'SUBSTRING(<VARCHAR> FROM <INTEGER>)'
> 'SUBSTRING(<VARCHAR> FROM <INTEGER> FOR <INTEGER>)'
> 'SUBSTRING(<BINARY> FROM <INTEGER>)'
> 'SUBSTRING(<BINARY> FROM <INTEGER> FOR <INTEGER>)'
> 'SUBSTRING(<VARBINARY> FROM <INTEGER>)'
> 'SUBSTRING(<VARBINARY> FROM <INTEGER> FOR <INTEGER>)'
> sql-cli> SELECT SUBSTRING('text' FROM NULL FOR 2);
> SQL query execution error
> Exception while executing query [query=SELECT SUBSTRING('text' FROM NULL FOR 2);]. Error message:From line 1, column 8
> to line 1, column 40: Cannot apply 'SUBSTRING' to arguments of type 'SUBSTRING(<CHAR(4)> FROM <NULL> FOR <INTEGER>)'. Supported form(s): 'SUBSTRING(<CHAR> FROM <INTEGER>)'
> 'SUBSTRING(<CHAR> FROM <INTEGER> FOR <INTEGER>)'
> 'SUBSTRING(<VARCHAR> FROM <INTEGER>)'
> 'SUBSTRING(<VARCHAR> FROM <INTEGER> FOR <INTEGER>)'
> 'SUBSTRING(<BINARY> FROM <INTEGER>)'
> 'SUBSTRING(<BINARY> FROM <INTEGER> FOR <INTEGER>)'
> 'SUBSTRING(<VARBINARY> FROM <INTEGER>)'
> 'SUBSTRING(<VARBINARY> FROM <INTEGER> FOR <INTEGER>)'
> {code}
> Only such request works fine:
> {code:sql}
> sql-cli> SELECT SUBSTRING(NULL FROM 1 FOR 2);
> ╔═════════╗
> ║ EXPR$0  ║
> ╠═════════╣
> ║ null    ║
> ╚═════════╝
> {code}



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