Remove not used expression functions

Signed-off-by: Xuanwo <github@xuanwo.io>

Author: Xuanwo

src/query/legacy-planners/src/lib.rs

@@ -13,7 +13,6 @@
 // limitations under the License.
 
 mod plan_delete;
-mod plan_empty;
 mod plan_expression;
 mod plan_expression_action;
 mod plan_expression_chain;
@@ -22,7 +21,6 @@ mod plan_expression_common;
 mod plan_expression_function;
 mod plan_expression_literal;
 mod plan_expression_monotonicity;
-mod plan_expression_sort;
 mod plan_expression_validator;
 mod plan_expression_visitor;
 mod plan_node_extras;
@@ -37,27 +35,11 @@ mod plan_sink;
 mod plan_table_recluster;
 
 pub use plan_delete::DeletePlan;
-pub use plan_empty::EmptyPlan;
 pub use plan_expression::Expression;
 pub use plan_expression::Expressions;
 pub use plan_expression_action::*;
 pub use plan_expression_chain::ExpressionChain;
 pub use plan_expression_column::col;
-pub use plan_expression_common::expand_aggregate_arg_exprs;
-pub use plan_expression_common::expand_wildcard;
-pub use plan_expression_common::expr_as_column_expr;
-pub use plan_expression_common::extract_aliases;
-pub use plan_expression_common::find_aggregate_exprs;
-pub use plan_expression_common::find_aggregate_exprs_in_expr;
-pub use plan_expression_common::find_column_exprs;
-pub use plan_expression_common::find_columns_not_satisfy_exprs;
-pub use plan_expression_common::find_window_exprs;
-pub use plan_expression_common::find_window_exprs_in_expr;
-pub use plan_expression_common::rebase_expr;
-pub use plan_expression_common::rebase_expr_from_input;
-pub use plan_expression_common::resolve_aliases_to_exprs;
-pub use plan_expression_common::sort_to_inner_expr;
-pub use plan_expression_common::unwrap_alias_exprs;
 pub use plan_expression_common::RequireColumnsVisitor;
 pub use plan_expression_function::add;
 pub use plan_expression_function::avg;
@@ -69,7 +51,6 @@ pub use plan_expression_function::sum;
 pub use plan_expression_literal::lit;
 pub use plan_expression_literal::lit_null;
 pub use plan_expression_monotonicity::ExpressionMonotonicityVisitor;
-pub use plan_expression_sort::sort;
 pub use plan_expression_validator::validate_clustering;
 pub use plan_expression_validator::validate_expression;
 pub use plan_expression_validator::validate_function_arg;