WilliamWhispell opened a new issue #8171: Slow double dimension query when useDefaultValueForNull set to false URL: https://github.com/apache/incubator-druid/issues/8171 For example, for a datasource called example if I have: "dimensionsSpec": { "dimensions": [ "SYMBOL", { "type": "float", "name": "FIELD1" }, { "type": "double", "name": "FIELD2" }] } Then querying this datasource, where that FIELD1 and FIELD2 column contain the same data, but one is stored using double, I find that: SELECT SYMBOL,FIELD1 from example WHERE __time = TIMESTAMP '2019-07-26 00:00:00' * Takes about 200 ms SELECT SYMBOL,FIELD2 from example WHERE __time = TIMESTAMP '2019-07-26 00:00:00' * takes about 10 seconds Now changing druid.generic.useDefaultValueForNull=true and restarting druid, when I load the data again into a new datasource example2, I find that that the double query is no longer slow and completes in about the same time as any other dimension query.
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