[teiid-issues] [JBoss JIRA] (TEIID-3743) Multiple Count Distinct Columns Fails for Impala

Multiple Count Distinct Columns Fails for Impala ------------------------------------------------ Key: TEIID-3743 URL: https://issues.jboss.org/browse/TEIID-3743 Project: Teiid Issue Type: Bug Components: Misc. Connectors Affects Versions: 8.11.4 Reporter: Scott Wallace Assignee: Steven Hawkins Teiid Impala translator incorrectly allows multiple count distinct columns. Per Cloudera documentation: {quote}By default, Impala only allows a single COUNT(DISTINCT columns) expression in each query. To produce the same result as multiple COUNT(DISTINCT) expressions, you can use the following technique for queries involving a single table: select v1.c1 result1, v2.c1 result2 from (select count(distinct col1) as c1 from t1) v1 cross join (select count(distinct col2) as c1 from t1) v2;{quote} The Teiid-Impala translator should ideally rewrite the query as necessary so that the query does not fail executing multiple count distincts against Impala.