xueyumusic commented on issue #7281: bump calcite version to 1.18.0 in druid-sql
URL: https://github.com/apache/incubator-druid/pull/7281#issuecomment-485133176
 
 
   @gianm How about writing a new rule such as DruidReduceEqualNullRule which 
makes `a=null` as `a=''` when nessesary.. thanks

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