@type t() :: %Xqlite.Schema.IndexColumnInfo{
  collation: String.t(),
  index_column_sequence: integer(),
  is_key_column: boolean(),
  name: String.t() | nil,
  sort_order: Xqlite.Schema.Types.sort_order(),
  table_column_id: integer()
}

Struct definition.

• :index_column_sequence - 0-based position of this column within the index key/definition.
• :table_column_id - The ID (0-based index) of the column in the base table definition, corresponding to the cid from PRAGMA table_info. A value of -1 indicates that the indexed item is an expression, not a direct table column.
• :name - Name of the table column included in the index, or nil if the index is on an expression.
• :sort_order - Sort order for this column (:asc or :desc).
• :collation - Name of the collation sequence used for this column (e.g., "BINARY", "NOCASE", "RTRIM").
• :is_key_column - true if this column is part of the primary index key used for lookups. false if it's an "included" column (only stored in the index, part of covering indexes, SQLite >= 3.9.0).