[CALCITE-1664] CAST('<string>' as TIMESTAMP) adds part of sub-second fraction to the value

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: avatica-1.10.0, 1.13.0
• Assignee: Julian Hyde
• Reporter: Remus Rusanu
• Created: 27/Feb/17 13:38
• Updated: 27/Feb/24 22:23
• Resolved: 31/May/17 18:09

Description

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

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.