Module row_expanders 

Row Expansion System

This module provides a generic framework for functions that multiply rows. Unlike regular functions (value → value) or generators (args → table), row expanders take a single input row and produce multiple output rows.

Use Cases

• UNNEST: Split delimited strings into separate rows
• EXPLODE: Expand JSON arrays
• GENERATE_SERIES: Create multiple rows from a range
• Custom expansions for domain-specific data

Modules

unnest

UNNEST expander implementation

Structs

ExpansionResult

Result of row expansion: a vector of values for this column across N rows

RowExpanderRegistry

Registry of available row expanders

Traits

RowExpander

Trait for row expander implementations