public class ColumnPruner extends Transform
Modifier and Type | Class and Description |
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static class |
ColumnPruner.ColumnPrunerWalker
Walks the op tree in post order fashion (skips selects with file sink or
script op children).
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Modifier and Type | Field and Description |
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protected ParseContext |
pGraphContext |
Constructor and Description |
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ColumnPruner()
empty constructor.
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Modifier and Type | Method and Description |
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ParseContext |
transform(ParseContext pactx)
Transform the query tree.
|
beginPerfLogging, endPerfLogging, endPerfLogging
protected ParseContext pGraphContext
public ParseContext transform(ParseContext pactx) throws SemanticException
transform
in class Transform
pactx
- the current parse contextSemanticException
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