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https://issues.apache.org/jira/browse/CALCITE-1211?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Mior resolved CALCITE-1211.
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Resolution: Fixed
> limit > 7 on the Cassandra Adapter switches to EnumerableLimit rule
> -------------------------------------------------------------------
>
> Key: CALCITE-1211
> URL: https://issues.apache.org/jira/browse/CALCITE-1211
> Project: Calcite
> Issue Type: Bug
> Affects Versions: 1.7.0
> Reporter: Dan Di Spaltro
> Assignee: Michael Mior
> Priority: Minor
>
> I copied the testProject query because I was noticing a {{EnumerableLimit}}
> showing up on explains when a limit was higher than `1`. So I narrowed it
> down to 7, anything above 7 and the plan looks like this
> {code}
> Plan after physical tweaks: EnumerableLimit(fetch=[8]): rowcount = 8.0,
> cumulative cost = {112.5 rows, 122.0 cpu, 0.0 io}, id = 2083
> CassandraToEnumerableConverter: rowcount = 15.0, cumulative cost = {104.5
> rows, 114.0 cpu, 0.0 io}, id = 2081
> CassandraProject(tweet_id=[$2]): rowcount = 15.0, cumulative cost =
> {103.0 rows, 112.5 cpu, 0.0 io}, id = 2079
> CassandraFilter(condition=[=(CAST($0):CHAR(8) CHARACTER SET
> "ISO-8859-1" COLLATE "ISO-8859-1$en_US$primary", '!PUBLIC!')]): rowcount =
> 15.0, cumulative cost = {101.5 rows, 111.0 cpu, 0.0 io}, id = 2077
> CassandraTableScan(table=[[twissandra, userline]]): rowcount = 100.0,
> cumulative cost = {100.0 rows, 101.0 cpu, 0.0 io}, id = 1915
> {code}
> anything {{7}} or below looks like this
> {code}
> CassandraToEnumerableConverter: rowcount = 7.0, cumulative cost =
> {111.07282262603232 rows, 112.75 cpu, 0.0 io}, id = 2257
> CassandraProject(tweet_id=[$2]): rowcount = 7.0, cumulative cost =
> {110.37282262603232 rows, 112.05 cpu, 0.0 io}, id = 2255
> CassandraSort(fetch=[7]): rowcount = 7.0, cumulative cost =
> {109.67282262603231 rows, 111.35 cpu, 0.0 io}, id = 2253
> CassandraFilter(condition=[=(CAST($0):CHAR(8) CHARACTER SET
> "ISO-8859-1" COLLATE "ISO-8859-1$en_US$primary", '!PUBLIC!')]): rowcount =
> 15.0, cumulative cost = {101.5 rows, 111.0 cpu, 0.0 io}, id = 2251
> CassandraTableScan(table=[[twissandra, userline]]): rowcount = 100.0,
> cumulative cost = {100.0 rows, 101.0 cpu, 0.0 io}, id = 2089
> {code}
> If I wanted to change that would I alter the cost of the sort rule?
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