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https://issues.apache.org/jira/browse/CALCITE-5143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17534132#comment-17534132
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Mitsunori Komatsu commented on CALCITE-5143:
--------------------------------------------
[~jiajunbernoulli] I've not throughly checked all databases, but PostgreSQL
seems to support the abbreviation
[https://www.postgresql.org/docs/current/datatype-datetime.html#DATATYPE-INTERVAL-ISO8601-UNITS].
{code:java}
postgres=# select extract (s from now());
date_part
-----------
23.592736
(1 row) {code}
> Planner#parse fails to parse a function when HOUR is passed as an argument
> --------------------------------------------------------------------------
>
> Key: CALCITE-5143
> URL: https://issues.apache.org/jira/browse/CALCITE-5143
> Project: Calcite
> Issue Type: Bug
> Components: babel
> Affects Versions: 1.30.0
> Reporter: Mitsunori Komatsu
> Priority: Major
>
> I'm trying to parse and rewrite some SQL dialects including SQL Server which
> supports some functions that receive HOUR as an argument using. But Calcite's
> Planner#parse can't handle this kind of SQL.
> {code:java}
> FrameworkConfig config = Frameworks.newConfigBuilder().build();
> Planner planner = Frameworks.getPlanner(config);
> System.out.println(planner.parse("SELECT DATEDIFF(HOUR, NOW(), NOW())"));
> {code}
> {code:java}
> Exception in thread "main" org.apache.calcite.sql.parser.SqlParseException:
> Incorrect syntax near the keyword 'HOUR' at line 2, column 21.
> Was expecting one of:
> "ALL" ...
> "ARRAY" ...
> "CASE" ...
> :
> "GROUPING" ...
> "HOUR" ...
> "HOUR" "(" ...
> "*" ...
> ")" ...
>
> at
> org.apache.calcite.sql.parser.impl.SqlParserImpl.convertException(SqlParserImpl.java:389)
> at
> org.apache.calcite.sql.parser.impl.SqlParserImpl.normalizeException(SqlParserImpl.java:153)
> at
> org.apache.calcite.sql.parser.SqlParser.handleException(SqlParser.java:145)
> at org.apache.calcite.sql.parser.SqlParser.parseQuery(SqlParser.java:160)
> at org.apache.calcite.sql.parser.SqlParser.parseStmt(SqlParser.java:185)
> at org.apache.calcite.prepare.PlannerImpl.parse(PlannerImpl.java:214)
> at org.apache.calcite.tools.Planner.parse(Planner.java:50) {code}
> This issue happens with other date/time keyword-ish ones like YEAR.
> I guess it happens because HOUR and YEAR are reserved keywords.
> Is this an expected behavior? If so, is there any workaround?
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