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Summary
In order to provide more information to the query optimizer about the data characteristics stored inside a table, such as the value distribution etc., U-SQL provides statistics on the tables. For most queries, the query optimizer already generates the necessary statistics for a high-quality query plan; in a few cases, you need to create additional statistics with CREATE STATISTICS or modify the query design to improve query performance.
Statistics DDL Statements
The following statements are supported:
Syntax
Statistics_DDL_Statement :=
Create_Statistics_Statement
| Update_Statistics_Statement
| Drop_Statistics_Statement.