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A visitor to optimize in the following scenario with streaming: Optimize when LOAD precedes STREAM and the loader class is the same as the serializer for the STREAM. |
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When the load statement in a pig script is loading a table from a meta data system (like owl) the load can be followed by a filter which can contain conditions on partition columns. |
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A visitor to discover if a foreach with flatten(s) can be pushed as low down the tree as possible. |
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A visitor to discover if a filter can be pushed as high up the tree as possible. |
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An optimizer for logical plans. |
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A visitor to reset all the schemas in a logical plan. |
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A visitor to reset all the schemas in a logical plan. |
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