Module plugin_adapter 

Adapter bridging legacy CustomScalarFn closures to uni-plugin’s ScalarPluginFn trait.

M2’s facade keeps the public CustomFunctionRegistry::register API intact while routing registrations into a shadow PluginRegistry. This adapter is the bridge: it wraps a Fn(&[Value]) -> Result<Value> closure into a type implementing ScalarPluginFn so it can live in the plugin registry.

As subsequent M2 commits migrate built-ins to native Arrow signatures (ArgType::Primitive), this row-per-call adapter remains as the slow path for legacy registrations declaring ArgType::CypherValue.

Structs

ValueRowFn

ScalarPluginFn impl that wraps a legacy Fn(&[Value]) -> Result<Value> closure.