Jenson
I am trying to add support in Isthmus for converting Apache Calcite `LogicalExchange`, as what I described in https://github.com/substrait-io/substrait-java/issues/153. But I run into some problems about how to map the...
Hi, we are using substrait & velox to build an OLAP execution engine. Besides specify the grouping keys of aggregation, we can also specify the pre-grouping keys in velox. Pre-grouping...
There are two not-nullable constraints in the Java implementation of MapVector: 1. Map data should be a non-nullable struct type; https://github.com/apache/arrow/blob/d4516c5386f84619dfdf2a9f72fed6d7df89704c/java/vector/src/main/java/org/apache/arrow/vector/complex/MapVector.java#L98 2. Map data key type should be a non-nullable;...