Function fmt_sql

datafusion/physical-expr-common/src/physical_expr.rs:617–630

Prints a [`PhysicalExpr`] in a SQL-like format # Example ``` # // The boilerplate needed to create a `PhysicalExpr` for the example use std::collections::HashMap; # use std::fmt::Formatter; # use std::sync::Arc; # use arrow::array::RecordBatch; # use arrow::datatypes::{DataType, Field, FieldRef, Schema}; # use datafusion_common::Result; # use datafusion_expr_common::columnar_value::ColumnarValue;

(expr: &dyn PhysicalExpr)

/// );
/// ```
pub fn fmt_sql(expr: &dyn PhysicalExpr) -> impl Display + '_ {
    struct Wrapper<'a> {
        expr: &'a dyn PhysicalExpr,
    }

    impl Display for Wrapper<'_> {
        fn fmt(&self, f: &mut Formatter) -> fmt::Result {
            self.expr.fmt_sql(f)?;
            Ok(())
        }
    }

    Wrapper { expr }
}

/// Take a snapshot of the given `PhysicalExpr` if it is dynamic.
///