Method create_physical_expr

datafusion/core/src/execution/context/mod.rs:804–810

Create a [`PhysicalExpr`] from an [`Expr`] after applying type coercion and function rewrites. Note: The expression is not [simplified] or otherwise optimized: `a = 1 + 2` will not be simplified to `a = 3` as this is a more involved process. See the [expr_api] example for how to simplify expressions. # Example ``` # use std::sync::Arc; # use arrow::datatypes::{DataType, Field, Schema}; # use dat

(
        &self,
        expr: Expr,
        df_schema: &DFSchema,
    )

    /// [simplified]: datafusion_optimizer::simplify_expressions
    /// [expr_api]: https://github.com/apache/datafusion/blob/main/datafusion-examples/examples/query_planning/expr_api.rs
    pub fn create_physical_expr(
        &self,
        expr: Expr,
        df_schema: &DFSchema,
    ) -> Result<Arc<dyn PhysicalExpr>> {
        self.state.read().create_physical_expr(expr, df_schema)
    }

    // return an empty dataframe
    fn return_empty_dataframe(&self) -> Result<DataFrame> {