[jira] [Created] (CALCITE-4134) Interval expressions

["Julian Hyde (Jira)" <ji...@apache.org>]

Julian Hyde created CALCITE-4134:
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             Summary: Interval expressions
                 Key: CALCITE-4134
                 URL: https://issues.apache.org/jira/browse/CALCITE-4134
             Project: Calcite
          Issue Type: Sub-task
            Reporter: Julian Hyde


Support interval expressions.

Standard SQL has only interval literals (e.g. {{INTERVAL '1' HOUR}}, {{INTERVAL -'1:2' HOUR TO MINUTE}}). Note that the 'value' part is a character literal and may contain formatting characters like ':'.

Interval expressions are a SQL extension present in [MySQL|https://dev.mysql.com/doc/refman/8.0/en/expressions.html#temporal-intervals] and [BigQuery|https://cloud.google.com/bigquery/docs/reference/standard-sql/datetime_functions#datetime_add]. We support the syntax {{INTERVAL numericExpression timeUnit}}:
* the 'value' part is a numeric expression;
* {{timeUnit}} is a time unit (such as {{HOUR}}), not a time unit range (such as {{HOUR TO MINUTE}});
* {{timeUnit}} may have precision, e.g. {{HOUR(2)}};
* {{timeUnit}} may be plural, e.g. {{HOURS}}, if {{SqlConformance.allowPluralTimeUnits}} (see CALCITE-3383);
* numeric literals and identifiers do not require parentheses, but other expressions require parentheses.

Examples:
* {{SELECT INTERVAL empno HOUR FROM Emp}}
* {{SELECT INTERVAL (empno * 2) MINUTE FROM Emp}}
* {{INTERVAL -3 YEAR}}




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