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https://issues.apache.org/jira/browse/CALCITE-5180?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17601545#comment-17601545
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Julian Hyde commented on CALCITE-5180:
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If the functions have ordinary function syntax, you won't need to change a
parser. Just add them to {{class SqlLibraryOperators}} and they will be picked
up. STRCMP (CALCITE-3704,
[1eff60b7|https://github.com/apache/calcite/commit/1eff60b70a1d71022862cca5e5b3bb1178a84392])
is a reasonable model.
> Implement BigQuery functions for DATE, TIME, TIMESTAMP, DATETIME
> ----------------------------------------------------------------
>
> Key: CALCITE-5180
> URL: https://issues.apache.org/jira/browse/CALCITE-5180
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Priority: Major
>
> Implement missing BigQuery functions for DATE, TIME, TIMESTAMP, DATETIME.
> Functions include:
> * CURRENT_DATE, CURRENT_DATETIME, CURRENT_TIME with timezone;
> * EXTRACT with time unit values WEEK(weekday), DATE, TIME;
> * various DATE, TIME, TIMESTAMP, DATETIME constructor functions;
> * DATE_ADD, DATETIME_ADD, TIME_ADD, TIMESTAMP_ADD;
> * DATE_SUB, DATETIME_SUB, TIME_SUB, TIMESTAMP_SUB;
> * DATE_DIFF, DATETIME_DIFF, TIME_DIFF, TIMESTAMP_DIFF;
> * DATE_TRUNC, DATETIME_TRUNC, TIME_TRUNC, TIMESTAMP_TRUNC;
> * LAST_DAY;
> * FORMAT_DATE, FORMAT_DATETIME, FORMAT_TIME, FORMAT_TIMESTAMP;
> * PARSE_DATE, PARSE_DATETIME, PARSE_TIME, PARSE_TIMESTAMP.
> The following functions are already implemented: CURRENT_DATETME,
> DATE(string), DATE_FROM_UNIX_DATE, TIMESTAMP_MICROS, TIMESTAMP_MILLIS,
> TIMESTAMP_SECONDS, UNIX_MICROS, UNIX_MILLIS, UNIX_SECONDS, UNIX_DATE.
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