robinyqiu commented on a change in pull request #12348:
URL: https://github.com/apache/beam/pull/12348#discussion_r466122482
##########
File path:
sdks/java/extensions/sql/zetasql/src/main/java/org/apache/beam/sdk/extensions/sql/zetasql/translation/ExpressionConverter.java
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@@ -850,6 +848,25 @@ private RexNode convertSimpleValueToRexNode(TypeKind kind,
Value value) {
// TODO: Doing micro to mills truncation, need to throw exception.
ret = rexBuilder().makeLiteral(convertTimeValueToTimeString(value),
timeType, false);
break;
+ case TYPE_DATETIME:
+ // Cannot simply call makeTimestampWithLocalTimeZoneLiteral() for
ZetaSQL DATETIME type
+ // because later it will be unparsed to the string representation of
timestamp (e.g. "SELECT
+ // DATETIME '2008-12-25 15:30:00'" will be unparsed to "SELECT
TIMESTAMP '2008-12-25
+ // 15:30:00:000000'"). So we create a wrapper function here such that
we can later recognize
+ // it and customize its unparsing in BeamBigQuerySqlDialect.
+ ret =
+ rexBuilder()
+ .makeCall(
+ SqlOperators.createZetaSqlFunction(
+ BeamBigQuerySqlDialect.DATETIME_LITERAL_FUNCTION,
Review comment:
To make it clearer, you can get the `TimestampString` value from the
`RexLiteral` like
https://github.com/apache/beam/blob/6fdde4f4eab72b49b10a8bb1cb3be263c5c416b5/sdks/java/extensions/sql/src/main/java/org/apache/beam/sdk/extensions/sql/meta/provider/bigquery/BeamSqlUnparseContext.java#L74,
and then use it to create your own `SqlDateTimeLiteral`.
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