org.apache.spark.sql.catalyst.expressions.codegen
Scala ASTs for evaluating an Expression given a Row of input.
Generates the requested evaluator given already bound expression(s).
Generates the requested evaluator given already bound expression(s).
Generates the requested evaluator binding the given expression(s) to the inputSchema.
Generates the requested evaluator binding the given expression(s) to the inputSchema.
Binds an input expression to a given input schema
Binds an input expression to a given input schema
A cache of generated classes.
A cache of generated classes.
From the Guava Docs: A Cache is similar to ConcurrentMap, but not quite the same. The most fundamental difference is that a ConcurrentMap persists all elements that are added to it until they are explicitly removed. A Cache on the other hand is generally configured to evict entries automatically, in order to constrain its memory footprint. Note that this cache does not use weak keys/values and thus does not respond to memory pressure.
Canonicalizes an input expression.
Canonicalizes an input expression. Used to avoid double caching expressions that differ only cosmetically.
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.
Can be flipped on manually in the console to add (expensive) expression evaluation trace code.
Can be flipped on manually in the console to add (expensive) expression evaluation trace code.
Given an expression tree returns an EvaluatedExpression, which contains Scala trees that can be used to determine the result of evaluating the expression on an input row.
Given an expression tree returns an EvaluatedExpression, which contains Scala trees that can be used to determine the result of evaluating the expression on an input row.
Returns a term name that is unique within this instance of a CodeGenerator.
Returns a term name that is unique within this instance of a CodeGenerator.
(Since we aren't in a macro context we do not seem to have access to the built in freshName
function.)
Generates bytecode that produces a new Row object based on a fixed set of input Expressions and a given input Row. The returned Row object is custom generated based on the output types of the Expression to avoid boxing of primitive values.