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Package org.apache.drill.exec.expr

Drill expression materialization and evaluation facilities.

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Package org.apache.drill.exec.expr Description

Drill expression materialization and evaluation facilities. Drill exposes an interface for defining custom scalar and aggregate functions. These functions are found by scanning the classpath at runtime and allow users to add their own functions without rebuilding Drill or changing cluster configuration. The classes that define these functions are actually decomposed at the source level, copied into generated code blocks to evaluate an entire expression tree. This generated source is built at run-time as schema is discovered. This package contains the DrillSimpleFunc and DrillAggFunc interfaces that can be implemented by users to define their own aggregate and scalar functions.
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