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Benjamin Lerer commented on CASSANDRA-11223: -------------------------------------------- I had a discussion with [~slebresne] one year ago about the static row filtering and we both agreed that we should fix that behavior. Unfortunately, I did not do it straight away and forgot about it. Now, my understanding is that those problems should be fixed by CASSANDRA-8272. [~adelapena] will those problems be solved by your patches for CASSANDRA-8272? > Queries with LIMIT filtering on clustering columns can return less rows than > expected > ------------------------------------------------------------------------------------- > > Key: CASSANDRA-11223 > URL: https://issues.apache.org/jira/browse/CASSANDRA-11223 > Project: Cassandra > Issue Type: Bug > Components: Local Write-Read Paths > Reporter: Benjamin Lerer > Assignee: Benjamin Lerer > > A query like {{SELECT * FROM %s WHERE b = 1 LIMIT 2 ALLOW FILTERING}} can > return less row than expected if the table has some static columns and some > of the partition have no rows matching b = 1. > The problem can be reproduced with the following unit test: > {code} > public void testFilteringOnClusteringColumnsWithLimitAndStaticColumns() > throws Throwable > { > createTable("CREATE TABLE %s (a int, b int, s int static, c int, > primary key (a, b))"); > for (int i = 0; i < 3; i++) > { > execute("INSERT INTO %s (a, s) VALUES (?, ?)", i, i); > for (int j = 0; j < 3; j++) > if (!(i == 0 && j == 1)) > execute("INSERT INTO %s (a, b, c) VALUES (?, ?, ?)", > i, j, i + j); > } > assertRows(execute("SELECT * FROM %s"), > row(1, 0, 1, 1), > row(1, 1, 1, 2), > row(1, 2, 1, 3), > row(0, 0, 0, 0), > row(0, 2, 0, 2), > row(2, 0, 2, 2), > row(2, 1, 2, 3), > row(2, 2, 2, 4)); > assertRows(execute("SELECT * FROM %s WHERE b = 1 ALLOW FILTERING"), > row(1, 1, 1, 2), > row(2, 1, 2, 3)); > assertRows(execute("SELECT * FROM %s WHERE b = 1 LIMIT 2 ALLOW > FILTERING"), > row(1, 1, 1, 2), > row(2, 1, 2, 3)); // <-------- FAIL It returns only one > row because the static row of partition 0 is counted and filtered out in > SELECT statement > } > {code} -- This message was sent by Atlassian JIRA (v6.4.14#64029) --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@cassandra.apache.org For additional commands, e-mail: commits-h...@cassandra.apache.org