imay opened a new pull request #1561: Unify Field and ColumnSchema in Storage
URL: https://github.com/apache/incubator-doris/pull/1561
 
 
   Currently, we have Field and ColumnSchema to access column data in a
   row. These two classes are mostly the same. So we should unify these to
   one class. Now, Field has offset information, which is an row attribute,
   so we remove offset in Field.
   
   RowCursor now has some logic which belong to Schema, so in this patch I
   add Schema attribute to RowCursor to make RowCursor simple. After this
   change, only Schema will handle Field/ColumnSchema.
   
   I extract some logic from RowCursor to be/src/olap/row.h, then we can
   use same logic to handle different types of row. Each type of row has
   same function that to get Cell of this row. A cell represent a column
   content with a null indicator.

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