spark技术分享Literal Leaf Expression
Literal is a leaf expression that is created to represent a Scala value of a specific type.
Literal is created when…MEFIXME
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Enabled when value is |
Creating Literal Instance — create Object Method
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create(v: Any, dataType: DataType): Literal |
create uses CatalystTypeConverters helper object to convert the input v Scala value to a Catalyst rows or types and creates a Literal (with the Catalyst value and the input DataType).
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create is used when…FIXME
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Generating Java Source Code (ExprCode) For Code-Generated Expression Evaluation — doGenCode Method
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doGenCode(ctx: CodegenContext, ev: ExprCode): ExprCode |
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doGenCode is part of Expression Contract to generate a Java source code (ExprCode) for code-generated expression evaluation.
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doGenCode…FIXME
