wuchong commented on a change in pull request #8462:
[FLINK-12496][table-planner-blink] Support translation from
StreamExecGroupWindowAggregate to StreamTransformation.
URL: https://github.com/apache/flink/pull/8462#discussion_r285832833
##########
File path:
flink-table/flink-table-planner-blink/src/main/java/org/apache/calcite/avatica/util/DateTimeUtils.java
##########
@@ -309,6 +309,28 @@ public static SimpleDateFormat newDateFormat(String
format) {
return sdf;
}
+ /** Helper for CAST({timestamp} Or {date} or {time} AS VARCHAR(n)). */
+ public static String unixDateTimeToString(Object o, TimeZone tz) {
Review comment:
This method is only used in `TestSinkUtil`, can we move it to
`TestSinkUtil`?
We want to avoid to maintain files copied from Calcite.
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