Module eval 

Expression evaluation over rows, with SQL three-valued logic.

The evaluator works both with a single Table and with a resolved query schema assembled by the planner for joins. Aggregate expressions are evaluated over a group through eval_group.

Structs

ColumnBinding

A column visible to a query, including the table names/aliases that qualify it. The position in a schema slice is its position in a joined row.

Functions

contains_aggregate

eval

Evaluate an expression against a single table row.

eval_group

Evaluate an expression over a group of rows. Non-aggregate expressions use the first row; aggregate expressions combine every row.

eval_with_schema

Evaluate an expression against a row and a resolved, possibly joined, schema. Unqualified ambiguous columns are rejected.

schema_for_table

validate_with_schema

Validate names, function names, and function arity without evaluating an expression. Query execution calls this before scanning so an empty input cannot hide a malformed or unresolved expression.

where_matches

WHERE filter: a row matches only when the predicate is exactly TRUE.

where_matches_with_schema