Jark Wu created FLINK-6817:
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Summary: Fix NPE when preceding is not set in OVER window
Key: FLINK-6817
URL: https://issues.apache.org/jira/browse/FLINK-6817
Project: Flink
Issue Type: Bug
Components: Table API & SQL
Reporter: Jark Wu
Priority: Minor
When preceding is not set in over window , a NPE will be thrown:
{code}
val result = table
.window(Over orderBy 'rowtime as 'w)
.select('c, 'a.count over 'w)
{code}
{code}
java.lang.NullPointerException
at org.apache.flink.table.api.OverWindowWithOrderBy.as(windows.scala:97)
{code}
Preceding must be set in OVER window, so should throw a more explicit exception
not a NPE
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