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https://issues.apache.org/jira/browse/FLINK-20349?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17239028#comment-17239028
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godfrey he commented on FLINK-20349:
------------------------------------
good catch
> Query fails with "A conflict is detected. This is unexpected."
> --------------------------------------------------------------
>
> Key: FLINK-20349
> URL: https://issues.apache.org/jira/browse/FLINK-20349
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Planner
> Reporter: Rui Li
> Assignee: Caizhi Weng
> Priority: Major
> Fix For: 1.12.0
>
>
> The test case to reproduce:
> {code}
> @Test
> public void test() throws Exception {
> tableEnv.executeSql("create table src(key string,val string)");
> tableEnv.executeSql("SELECT sum(char_length(src5.src1_value))
> FROM " +
> "(SELECT src3.*, src4.val as src4_value,
> src4.key as src4_key FROM src src4 JOIN " +
> "(SELECT src2.*, src1.key as src1_key, src1.val
> as src1_value FROM src src1 JOIN src src2 ON src1.key = src2.key) src3 " +
> "ON src3.src1_key = src4.key) src5").collect();
> }
> {code}
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