Module datafusion_expr::expr_rewriter

Expression rewriter

Traits

• FunctionRewrite
  Trait for rewriting Exprs into function calls.

Functions

• coerce_plan_expr_for_schema
  Returns plan with expressions coerced to types compatible with schema types
• create_col_from_scalar_expr
  Create a Column from the Scalar Expr
• normalize_col
  Recursively call Column::normalize_with_schemas on all Column expressions in the expr expression tree.
• normalize_col_with_schemas_and_ambiguity_check
  See Column::normalize_with_schemas_and_ambiguity_check for usage
• normalize_cols
  Recursively normalize all Column expressions in a list of expression trees
• replace_col
  Recursively replace all Column expressions in a given expression tree with Column expressions provided by the hash map argument.
• rewrite_preserving_name
  Rewrites expr using rewriter, ensuring that the output has the same name as expr prior to rewrite, adding an alias if necessary.
• rewrite_sort_cols_by_aggs
  Rewrite sort on aggregate expressions to sort on the column of aggregate output For example, max(x) is written to col("MAX(x)")
• strip_outer_reference
  Recursively remove all the [‘OuterReferenceColumn’] and return the inside Column in the expression tree.
• unalias
  Recursively un-alias an expressions
• unnormalize_col
  Recursively ‘unnormalize’ (remove all qualifiers) from an expression tree.
• unnormalize_cols
  Recursively un-normalize all Column expressions in a list of expression trees