Exasol UDFs & Script Language Containers

Trigger when the user mentions UDF, user defined function, CREATE SCRIPT, ExaIterator, SCALAR, SET EMITS, BucketFS, script language container, SLC, exaslct, custom packages, GPU UDF, ctx.emit, ctx.next, variadic script, dynamic parameters, EMITS(...), default_output_columns, or any UDF/SLC-related topic.

When to Use UDFs

Use UDFs to extend SQL with custom logic that runs inside the Exasol cluster:

• Per-row transforms (cleaning, parsing, hashing)
• Custom aggregation across grouped rows
• ML model inference (load model from BucketFS, score rows)
• Calling external APIs from within SQL
• Batch processing with DataFrames

SCALAR vs SET Decision Guide