Abhishek Agarwal 1b8808cce8 Fix SQL queries for inline datasource with null values (#12092) ... Fixes a bug because of which some SQL queries cannot be parsed using druid convention. Specifically, these queries translate to an inline datasource and have some null values. Calcite internally uses NULL as SQL type for these literals and that is not supported by the druid. I am now allowing null column types to be returned while building RowSignature in org.apache.druid.sql.calcite.table.RowSignatures#fromRelDataType. RowSignature already allows null column type for any column. Doing so should also fix bindable queries such as select (1,2). When such queries are run with headers set to true, we get an exception in org.apache.druid.sql.http.ArrayWriter#writeHeader. This is again a similar exception to the one addressed in this PR. Because SQL type for the result column is RECORD and that doesn't have a corresponding columnType.		2022-01-27 18:04:12 +05:30
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src	Fix SQL queries for inline datasource with null values (#12092)	2022-01-27 18:04:12 +05:30
pom.xml	Add druid.sql.approxCountDistinct.function property. (#11181)	2021-10-25 12:16:21 -07:00