getSecondaryProllyIndexWriters(ctx context.Context, t *doltdb.Table, sqlSch sql.Schema, sch schema.Schema)
: (map[string]indexWriter, error)
getSecondaryKeylessProllyWriters(ctx context.Context, t *doltdb.Table, sqlSch sql.Schema, sch schema.Schema, primary prollyKeylessWriter)
: (map[string]indexWriter, error)