abstract class CodeGenerator[InType <: AnyRef, OutType <: AnyRef] extends Logging
A base class for generators of byte code to perform expression evaluation. Includes a set of helpers for referring to Catalyst types and building trees that perform evaluation of individual expressions.
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- new CodeGenerator()
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- abstract def bind(in: InType, inputSchema: Seq[Attribute]): InType
Binds an input expression to a given input schema
Binds an input expression to a given input schema
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- abstract def canonicalize(in: InType): InType
Canonicalizes an input expression.
Canonicalizes an input expression. Used to avoid double caching expressions that differ only cosmetically.
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- abstract def create(in: InType): OutType
Generates a class for a given input expression.
Generates a class for a given input expression. Called when there is not cached code already available.
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- def generate(expressions: InType): OutType
Generates the requested evaluator given already bound expression(s).
- def generate(expressions: InType, inputSchema: Seq[Attribute]): OutType
Generates the requested evaluator binding the given expression(s) to the inputSchema.
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- def newCodeGenContext(): CodegenContext
Create a new codegen context for expression evaluator, used to store those expressions that don't support codegen
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