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These settings are available in system.settings and are autogenerated from source.

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webassembly_udf_max_fuel

Fuel limit per WebAssembly UDF instance execution. Each WebAssembly instruction consumes some amount of fuel. The value is scaled by 1024 before being passed to the runtime, so webassembly_udf_max_fuel = 1 corresponds to approximately 1024 fuel units. Set to 0 for no finite limit. Applies only to functions whose per-function setting webassembly_udf_enable_fuel is true, which is the default.

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webassembly_udf_max_input_block_size

Maximum number of rows passed to a WebAssembly UDF in a single block. Set to 0 to process all rows at once.

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webassembly_udf_max_instances

Maximum number of WebAssembly UDF instances that can run in parallel per function.

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webassembly_udf_max_memory

Memory limit in bytes per WebAssembly UDF instance.
Last modified on July 24, 2026