wuchong commented on a change in pull request #12806:
URL: https://github.com/apache/flink/pull/12806#discussion_r449405365
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File path:
flink-table/flink-table-common/src/main/java/org/apache/flink/table/api/TableSchema.java
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@@ -421,9 +421,9 @@ private static void validateColumnsAndWatermarkSpecs(
LogicalType watermarkOutputType =
watermark.getWatermarkExprOutputType().getLogicalType();
if (watermarkOutputType.getTypeRoot() !=
TIMESTAMP_WITHOUT_TIME_ZONE) {
throw new ValidationException(String.format(
- "Watermark strategy '%s' must be of
type TIMESTAMP but is of type '%s'.",
Review comment:
I added a test for empty char. The exception message will be `Watermark
strategy '''' must be`...
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