Jackie-Jiang opened a new pull request #6649:
URL: https://github.com/apache/incubator-pinot/pull/6649


   ## Description
   Currently, when a column is added to the schema, server will generate 
default columns if the segment does not have the new column. But when a column 
is removed from the schema, the server still load all the columns within the 
segments. This could cause problem for `select *` queries because different 
segments might contain different columns.
   With the change, server will skip loading the columns not in the schema, and 
all the segments should have the same set of columns loaded.


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