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In groupByExpression columns are specified by name, not by position number. However in Hive 0.11.0 and later, columns can be specified by position if when configured as follows:

•  Set hive.groupby.orderby.position.alias

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•  to true (the default is false) for Hive 0.11.0 through 2.1.x.
• Set hive.groupby.position.alias to true (the default is false) for Hive 2.2.0 and later.
  

Simple Examples

In order to count the number of rows in a table:

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