class_docstr: Visits the SQL query plan to simplify sub-queries. On each visit, return a simplified node.
  
  Unlike SqlSubQueryReducerVisitor, this will re-write expressions to realize more reductions.
code: def _rewrite_select_columns(
      old_select_columns: Tuple[SqlSelectColumn, ...],
      column_replacements: SqlColumnReplacements,
  ) -> Tuple[SqlSelectColumn, ...]:
      return tuple(
          SqlSelectColumn(
              expr=x.expr.rewrite(column_replacements),
              column_alias=x.column_alias,
          )
          for x in old_select_columns
      )
  
imports: from __future__ import annotations
  import logging
  from dataclasses import dataclass
  from typing import List, Optional, Sequence, Tuple
  from metricflow.sql.optimizer.sql_query_plan_optimizer import SqlQueryPlanOptimizer
  from metricflow.sql.sql_exprs import SqlColumnAliasReferenceExpression, SqlColumnReference, SqlColumnReplacements, SqlExpressionNode, SqlExpressionTreeLineage, SqlLogicalExpression, SqlLogicalOperator
  from metricflow.sql.sql_plan import SqlJoinDescription, SqlOrderByDescription, SqlQueryPlanNode, SqlQueryPlanNodeVisitor, SqlSelectColumn, SqlSelectQueryFromClauseNode, SqlSelectStatementNode, SqlTableFromClauseNode
label_desc: Use image node_id 10 for calling the SqlRewritingSubQueryReducerVisitor obj's underlying member method code with example usage: obj._rewrite_select_columns(old_select_columns, column_replacements) and returns: tuple