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OpenAccess SDK SQL engine and IP interaction : Query processing: with table expression pushdown
 

Query processing: with table expression pushdown

The OpenAccess SDK SQL engine can be called to parse the query and expose the WHERE clause for each of the tables involved in the query. This is done as an expression tree that can be accessed using the SQL Parse Tree API of the OpenAccess SDK SQL engine. This mode of operation is ideal when the data source is capable of handling expressions in retrieving rows for a table. See Implementing Table Expression Pushdown for more information.