io.delta.kernel.client

Interface ExpressionHandler

public interface ExpressionHandler

Provides expression evaluation capability to Delta Kernel. Delta Kernel can use this client to evaluate predicate on partition filters, fill up partition column values and any computation on data using Expressions.

Method Summary

Modifier and Type	Method and Description
ExpressionEvaluator	getEvaluator(StructType batchSchema, Expression expression) Create an ExpressionEvaluator that can evaluate the given expression on ColumnarBatchs with the given batchSchema.

Method Detail

getEvaluator

ExpressionEvaluator getEvaluator(StructType batchSchema,
                                 Expression expression)

Create an ExpressionEvaluator that can evaluate the given expression on ColumnarBatchs with the given batchSchema.

Parameters:

batchSchema - Schema of the input data.

expression - Expression to evaluate.

Returns:

An ExpressionEvaluator instance bound to the given expression and batchSchema.