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https://issues.apache.org/jira/browse/CALCITE-1805?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jesus Camacho Rodriguez reopened CALCITE-1805:
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> Druid adapter incorrectly pushes down "COUNT(c)"; Druid only supports
> "COUNT(*)"
> --------------------------------------------------------------------------------
>
> Key: CALCITE-1805
> URL: https://issues.apache.org/jira/browse/CALCITE-1805
> Project: Calcite
> Issue Type: Bug
> Components: druid
> Affects Versions: 1.12.0
> Reporter: slim bouguerra
> Assignee: slim bouguerra
> Fix For: 1.13.0
>
>
> Currently queries like
> {code}select count(column) from table{code} is pushed to druid as timeseries
> with an aggregator {code}
> {"type":"count","name":"EXPR$0","fieldName":"countryName"} {code}
> Such an aggregator does not exist in druid. The count aggregator does only
> work as {code} count(*) {code}.
> here is a test case that summarize the issue.
> {code} @Test public void testCount() {
> final String sql = "SELECT count(\"countryName\") FROM (SELECT
> \"countryName\" FROM \"wikiticker\" WHERE \"countryName\" IS NOT NULL) as
> a"; // correct count
> sql(sql, WIKI_AUTO2).returnsUnordered("EXPR$0=3799");
> final String sql2 = "SELECT count(\"countryName\") FROM (SELECT
> \"countryName\" FROM \"wikiticker\") as a";
> sql(sql2, WIKI_AUTO2).returnsUnordered("EXPR$0=3799"); // it will fail
> }{code} First test will pass while the second will not.
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