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Birt: Avoid executing dataset when the bound table in report is hidden

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I am new to BIRT reports.

My report has 22 tables, each table being filled using a dataset.

Now, a user has an option from the UI through 22 checkboxes to select which table to show and which one to hide. He also has a 23rd checkbox to select all tables.

The requirement::

When the user hides any table, the dataset to which the table is binded, should not be executed.

Can i use beforeOpen method for this??? If yes, how???

This is important because each dataset has one stored proc call and each stored proc is having on an average 7 JOINs.

Please help because this is making my report generation time really long.

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