Function validate_row 

pub fn validate_row(
    table: &Table,
    row: &Map<String, Value>,
) -> Result<(), ValidationError>

Validate a JSON row against a table definition.

Checks performed:

• not-null constraints
• type compatibility with the column’s ColumnType
• enum_values membership
• numeric min / max
• string/bytes min_length / max_length
• regex pattern match
• JSON parseability for Json columns
• table-level check_constraints names (validation of the expression itself is left to the runtime that registered the named check)