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Minor: Add example with parameters to LogicalPlan #8418

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Dec 5, 2023
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Minor: Add example with parameters to LogicalPlan #8418

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31 changes: 25 additions & 6 deletions datafusion/expr/src/logical_plan/plan.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -976,20 +976,39 @@ impl LogicalPlan {
/// .filter(col("id").eq(placeholder("$1"))).unwrap()
/// .build().unwrap();
///
/// assert_eq!("Filter: t1.id = $1\
/// \n TableScan: t1",
/// plan.display_indent().to_string()
/// assert_eq!(
/// "Filter: t1.id = $1\
/// \n TableScan: t1",
/// plan.display_indent().to_string()
/// );
///
/// // Fill in the parameter $1 with a literal 3
/// let plan = plan.with_param_values(vec![
/// ScalarValue::from(3i32) // value at index 0 --> $1
/// ]).unwrap();
///
/// assert_eq!("Filter: t1.id = Int32(3)\
/// \n TableScan: t1",
/// plan.display_indent().to_string()
/// assert_eq!(
/// "Filter: t1.id = Int32(3)\
/// \n TableScan: t1",
/// plan.display_indent().to_string()
/// );
///
/// // Note you can also used named parameters
/// // Build SELECT * FROM t1 WHRERE id = $my_param
/// let plan = table_scan(Some("t1"), &schema, None).unwrap()
/// .filter(col("id").eq(placeholder("$my_param"))).unwrap()
/// .build().unwrap()
/// // Fill in the parameter $my_param with a literal 3
/// .with_param_values(vec![
/// ("my_param", ScalarValue::from(3i32)),
/// ]).unwrap();
///
/// assert_eq!(
/// "Filter: t1.id = Int32(3)\
/// \n TableScan: t1",
/// plan.display_indent().to_string()
/// );
///
/// ```
pub fn with_param_values(
self,
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