[flink] Fix that 'values-time' partition expire might throw NPE #4646
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Purpose
A simple case:
CREATE TABLE T (k INT, ds STRING) PARTITIONED BY (ds);
INSERT INTO T VALUES (1, CAST (NULL AS STRING));
CALL sys.expire_partitions(
table=> 'default.T', expiration_time => '1 d', timestamp_formatter => 'yyyyMMdd');Throws NPE.
Tests
API and Format
Documentation