[jira] [Created] (DRILL-3430) CAST to interval type doesn't accept standard-format strings

["Daniel Barclay (Drill) (JIRA)" <ji...@apache.org>]

Daniel Barclay (Drill) created DRILL-3430:
---------------------------------------------

             Summary: CAST to interval type doesn't accept standard-format strings
                 Key: DRILL-3430
                 URL: https://issues.apache.org/jira/browse/DRILL-3430
             Project: Apache Drill
          Issue Type: Bug
            Reporter: Daniel Barclay (Drill)


Cast specification evaluation is not compliant with the SQL standard.  Mainly, it yields errors for standard-format strings that are specified to successfully yield interval values.

In ISO/IEC 9075-2:2011(E) section 6.13 <cast specification>, General Rule 19 case b says that, in a <cast specification> casting to an interval type, a character string value that is a valid interval <literal> (<interval literal>) or <unquoted interval string> yields an interval value.

(<interval literal> is the "INTERVAL '1-6' YEAR TO MONTH" syntax; <unquoted interval string> is the "1-6" syntax.)

Drill currently rejects both of those syntaxes.  Note the casts to type INTERVAL HOUR and the resulting error messages in the following:

{noformat}
0: jdbc:drill:zk=local> SELECT CAST( CAST( 'INTERVAL ''1'' HOUR' AS VARCHAR(100) ) AS INTERVAL HOUR) FROM INFORMATION_SCHEMA.CATALOGS;
Error: SYSTEM ERROR: IllegalArgumentException: Invalid format: "INTERVAL '1' HOUR"

Fragment 0:0

[Error Id: b4bed61a-1efe-4e06-86d4-fff8f9829d50 on dev-linux2:31010] (state=,code=0)
0: jdbc:drill:zk=local> SELECT CAST( CAST( '1' AS VARCHAR(100) ) AS INTERVAL HOUR) FROM INFORMATION_SCHEMA.CATALOGS;
Error: SYSTEM ERROR: IllegalArgumentException: Invalid format: "1"

Fragment 0:0

[Error Id: 91dec1ed-5cac-4235-93d7-49a2a0f03a1a on dev-linux2:31010] (state=,code=0)
0: jdbc:drill:zk=local> 
{noformat}

(The extra cast to VARCHAR is a workaround for a CHAR-vs.-VARCHAR bug.)

Drill should accept the standard formats or at least document the non-compliance for users.






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