Module functions 

Smart function completions for SQL.

This module provides function completion items with full signatures, return types, and context-aware filtering based on clause type.

Performance

Function completion items are pre-computed and cached at startup using LazyLock. The cache contains one CompletionItem per SQL function (450+). On each completion request, we filter and clone items from the cache, avoiding the cost of re-computing signatures and formatting strings.

Structs

FunctionCompletionContext

Context for function completion filtering and scoring.

Functions

function_return_type_display

Returns the return type display string for a function, if known.

function_to_completion_item

Converts a function signature to a completion item.

get_function_completions

Gets function completions filtered and scored by context.

is_aggregate

Returns true if the function is an aggregate function.

is_window

Returns true if the function is a window function.