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https://issues.apache.org/jira/browse/CALCITE-1664?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julian Hyde reopened CALCITE-1664:
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> CAST('<string>' as TIMESTAMP) adds part of sub-second fraction to the value
> ---------------------------------------------------------------------------
>
> Key: CALCITE-1664
> URL: https://issues.apache.org/jira/browse/CALCITE-1664
> Project: Calcite
> Issue Type: Bug
> Reporter: Remus Rusanu
> Assignee: Julian Hyde
> Fix For: avatica-1.10.0
>
>
> {noformat}
> select
> TIMESTAMP '2016-02-26 19:06:00',
> CAST('2016-02-26 19:06:00' as TIMESTAMP);
> +---------------------+---------------------+
> | EXPR$0 | EXPR$1 |
> +---------------------+---------------------+
> | 2016-02-26 19:06:00 | 2016-02-26 19:06:00 |
> +---------------------+---------------------+
> !ok
> select
> TIMESTAMP '2016-02-26 19:06:00.1',
> CAST('2016-02-26 19:06:00.1' as TIMESTAMP),
> TIMESTAMPDIFF(SECOND,
> TIMESTAMP '2016-02-26 19:06:00.1',
> CAST('2016-02-26 19:06:00.1' as TIMESTAMP));
> +---------------------+---------------------+--------+
> | EXPR$0 | EXPR$1 | EXPR$2 |
> +---------------------+---------------------+--------+
> | 2016-02-26 19:06:00 | 2016-02-26 19:06:00 | 0 |
> +---------------------+---------------------+--------+
> !ok
> select
> TIMESTAMP '2016-02-26 19:06:00.123456',
> CAST('2016-02-26 19:06:00.123456' as TIMESTAMP),
> TIMESTAMPDIFF(SECOND,
> TIMESTAMP '2016-02-26 19:06:00.123456',
> CAST('2016-02-26 19:06:00.123456' as TIMESTAMP));
> +---------------------+---------------------+--------+
> | EXPR$0 | EXPR$1 | EXPR$2 |
> +---------------------+---------------------+--------+
> | 2016-02-26 19:06:00 | 2016-02-26 19:08:03 | 123 |
> +---------------------+---------------------+--------+
> !ok
> select
> TIMESTAMP '2016-02-26 19:06:00.12345678',
> CAST('2016-02-26 19:06:00.12345678' as TIMESTAMP),
> TIMESTAMPDIFF(SECOND,
> TIMESTAMP '2016-02-26 19:06:00.123456789',
> CAST('2016-02-26 19:06:00.123456789' as TIMESTAMP));
> +---------------------+---------------------+--------+
> | EXPR$0 | EXPR$1 | EXPR$2 |
> +---------------------+---------------------+--------+
> | 2016-02-26 19:06:00 | 2016-02-26 22:31:46 | 123456 |
> +---------------------+---------------------+--------+
> !ok
> {noformat}
> Note how {{TIMESTAMP <string>}} parses the value correctly (not sure if the
> sub-second fraction is parsed though) but {{CAST}} adds part of the
> sub-second fraction as a seconds to the value.
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