Cloudera Docs

Join elimination

Join elimination improves query execution and visual rendering in Cloudera Data Visualization.

Join elimination is available both for left outer and inner joins. It is turned on by default.

When a visual uses fields and expressions that reference only a subset of the joined tables that form the dataset, this feature eliminates the unnecessary joins and access only the necessary subset of the joined tables. This improves query execution speeds, and renders the visuals faster.

  1. Click the Edit (pencil) icon.
  2. You can eanble or disable join elimination:

    • Disabling: select the Disabled option.

    • Enabling: select the Enabled option.

  3. Click Save.