Github user BJangir commented on the issue:
https://github.com/apache/carbondata/pull/1861
@xubo245 ,
if agg table is already created and create datamap command is fired again
with "if not exists" syntax then processMetadata will not return any Error (as
expected ) but then processData will be triggered
and processData will throw error because createPreAggregateTableCommands
is not initialized . So "table exists" check need to handle in processData
also . Steps to reproduce
1. Create table maintable
2. load data maintable
3. Create datamap map1 on table maintable
4. Create datamap if not exists map1 on table maintable
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