xonx4l commented on issue #18845:
URL: https://github.com/apache/datafusion/issues/18845#issuecomment-3600427561
@alamb Adopt a one-time “binding” pass that resolves every logical Expr
against its input ExprSchema before planning continues. The pass produces a
BoundExpr that carries immutable typing metadata:
BoundExpr = { expr: Expr, field: FieldRef, table_reference:
Option<TableReference> }
field captures both DataType and nullability. it’s computed exactly once
while binding.
Each planner/optimizer node replaces raw Expr with BoundExpr downstream code
consumes only bound expressions, so repeated calls to Expr::get_type / nullable
/ to_field disappear entirely.
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