refactor: move PREPARE/EXECUTE into LogicalPlan::Statement

datafusion/core/src/execution/context/mod.rs

@@ -688,11 +688,11 @@ impl SessionContext {
             LogicalPlan::Statement(Statement::SetVariable(stmt)) => {
                 self.set_variable(stmt).await
             }
-            LogicalPlan::Prepare(Prepare {
+            LogicalPlan::Statement(Statement::Prepare(Prepare {
                 name,
                 input,
                 data_types,
-            }) => {
+            })) => {
                 // The number of parameters must match the specified data types length.
                 if !data_types.is_empty() {
                     let param_names = input.get_parameter_names()?;
@@ -712,7 +712,9 @@ impl SessionContext {
                 self.state.write().store_prepared(name, data_types, input)?;
                 self.return_empty_dataframe()
             }
-            LogicalPlan::Execute(execute) => self.execute_prepared(execute),
+            LogicalPlan::Statement(Statement::Execute(execute)) => {
+                self.execute_prepared(execute)
+            }
             plan => Ok(DataFrame::new(self.state(), plan)),
         }
     }
@@ -1773,14 +1775,6 @@ impl<'n, 'a> TreeNodeVisitor<'n> for BadPlanVisitor<'a> {
             LogicalPlan::Statement(stmt) if !self.options.allow_statements => {
                 plan_err!("Statement not supported: {}", stmt.name())
             }
-            // TODO: Implement PREPARE as a LogicalPlan::Statement
-            LogicalPlan::Prepare(_) if !self.options.allow_statements => {
-                plan_err!("Statement not supported: PREPARE")
-            }
-            // TODO: Implement EXECUTE as a LogicalPlan::Statement
-            LogicalPlan::Execute(_) if !self.options.allow_statements => {
-                plan_err!("Statement not supported: EXECUTE")
-            }
             _ => Ok(TreeNodeRecursion::Continue),
         }
     }

datafusion/core/src/physical_planner.rs

@@ -1195,15 +1195,6 @@ impl DefaultPhysicalPlanner {
                 let name = statement.name();
                 return not_impl_err!("Unsupported logical plan: Statement({name})");
             }
-            LogicalPlan::Prepare(_) => {
-                // There is no default plan for "PREPARE" -- it must be
-                // handled at a higher level (so that the appropriate
-                // statement can be prepared)
-                return not_impl_err!("Unsupported logical plan: Prepare");
-            }
-            LogicalPlan::Execute(_) => {
-                return not_impl_err!("Unsupported logical plan: Execute");
-            }
             LogicalPlan::Dml(dml) => {
                 // DataFusion is a read-only query engine, but also a library, so consumers may implement this
                 return not_impl_err!("Unsupported logical plan: Dml({0})", dml.op);

datafusion/core/tests/sql/sql_api.rs

@@ -124,12 +124,12 @@ async fn disable_prepare_and_execute_statement() {
     let df = ctx.sql_with_options(prepare_sql, options).await;
     assert_eq!(
         df.unwrap_err().strip_backtrace(),
-        "Error during planning: Statement not supported: PREPARE"
+        "Error during planning: Statement not supported: Prepare"
     );
     let df = ctx.sql_with_options(execute_sql, options).await;
     assert_eq!(
         df.unwrap_err().strip_backtrace(),
-        "Error during planning: Statement not supported: EXECUTE"
+        "Error during planning: Statement not supported: Execute"
     );
 
     let options = options.with_allow_statements(true);

datafusion/expr/src/expr_rewriter/mod.rs

@@ -314,7 +314,7 @@ impl NamePreserver {
                     | LogicalPlan::Join(_)
                     | LogicalPlan::TableScan(_)
                     | LogicalPlan::Limit(_)
-                    | LogicalPlan::Execute(_)
+                    | LogicalPlan::Statement(_)
             ),
         }
     }

datafusion/expr/src/logical_plan/builder.rs

@@ -42,7 +42,7 @@ use crate::utils::{
 };
 use crate::{
     and, binary_expr, lit, DmlStatement, Expr, ExprSchemable, Operator, RecursiveQuery,
-    TableProviderFilterPushDown, TableSource, WriteOp,
+    Statement, TableProviderFilterPushDown, TableSource, WriteOp,
 };
 
 use super::dml::InsertOp;
@@ -500,11 +500,13 @@ impl LogicalPlanBuilder {
 
     /// Make a builder for a prepare logical plan from the builder's plan
     pub fn prepare(self, name: String, data_types: Vec<DataType>) -> Result<Self> {
-        Ok(Self::new(LogicalPlan::Prepare(Prepare {
-            name,
-            data_types,
-            input: self.plan,
-        })))
+        Ok(Self::new(LogicalPlan::Statement(Statement::Prepare(
+            Prepare {
+                name,
+                data_types,
+                input: self.plan,
+            },
+        ))))
     }
 
     /// Limit the number of rows returned

datafusion/expr/src/logical_plan/display.rs

@@ -21,10 +21,10 @@ use std::collections::HashMap;
 use std::fmt;
 
 use crate::{
-    expr_vec_fmt, Aggregate, DescribeTable, Distinct, DistinctOn, DmlStatement, Execute,
-    Expr, Filter, Join, Limit, LogicalPlan, Partitioning, Prepare, Projection,
-    RecursiveQuery, Repartition, Sort, Subquery, SubqueryAlias,
-    TableProviderFilterPushDown, TableScan, Unnest, Values, Window,
+    expr_vec_fmt, Aggregate, DescribeTable, Distinct, DistinctOn, DmlStatement, Expr,
+    Filter, Join, Limit, LogicalPlan, Partitioning, Projection, RecursiveQuery,
+    Repartition, Sort, Subquery, SubqueryAlias, TableProviderFilterPushDown, TableScan,
+    Unnest, Values, Window,
 };
 
 use crate::dml::CopyTo;
@@ -618,24 +618,6 @@ impl<'a, 'b> PgJsonVisitor<'a, 'b> {
                     "Detail": format!("{:?}", e.node)
                 })
             }
-            LogicalPlan::Prepare(Prepare {
-                name, data_types, ..
-            }) => {
-                json!({
-                    "Node Type": "Prepare",
-                    "Name": name,
-                    "Data Types": format!("{:?}", data_types)
-                })
-            }
-            LogicalPlan::Execute(Execute {
-                name, parameters, ..
-            }) => {
-                json!({
-                    "Node Type": "Execute",
-                    "Name": name,
-                    "Parameters": expr_vec_fmt!(parameters),
-                })
-            }
             LogicalPlan::DescribeTable(DescribeTable { .. }) => {
                 json!({
                     "Node Type": "DescribeTable"

datafusion/expr/src/logical_plan/mod.rs

@@ -36,14 +36,14 @@ pub use ddl::{
 pub use dml::{DmlStatement, WriteOp};
 pub use plan::{
     projection_schema, Aggregate, Analyze, ColumnUnnestList, DescribeTable, Distinct,
-    DistinctOn, EmptyRelation, Execute, Explain, Extension, FetchType, Filter, Join,
-    JoinConstraint, JoinType, Limit, LogicalPlan, Partitioning, PlanType, Prepare,
-    Projection, RecursiveQuery, Repartition, SkipType, Sort, StringifiedPlan, Subquery,
+    DistinctOn, EmptyRelation, Explain, Extension, FetchType, Filter, Join,
+    JoinConstraint, JoinType, Limit, LogicalPlan, Partitioning, PlanType, Projection,
+    RecursiveQuery, Repartition, SkipType, Sort, StringifiedPlan, Subquery,
     SubqueryAlias, TableScan, ToStringifiedPlan, Union, Unnest, Values, Window,
 };
 pub use statement::{
-    SetVariable, Statement, TransactionAccessMode, TransactionConclusion, TransactionEnd,
-    TransactionIsolationLevel, TransactionStart,
+    Execute, Prepare, SetVariable, Statement, TransactionAccessMode,
+    TransactionConclusion, TransactionEnd, TransactionIsolationLevel, TransactionStart,
 };
 
 pub use display::display_schema;

datafusion/expr/src/logical_plan/plan.rs

@@ -39,9 +39,9 @@ use crate::utils::{
     split_conjunction,
 };
 use crate::{
-    build_join_schema, expr_vec_fmt, BinaryExpr, CreateMemoryTable, CreateView, Expr,
-    ExprSchemable, LogicalPlanBuilder, Operator, TableProviderFilterPushDown,
-    TableSource, WindowFunctionDefinition,
+    build_join_schema, expr_vec_fmt, BinaryExpr, CreateMemoryTable, CreateView, Execute,
+    Expr, ExprSchemable, LogicalPlanBuilder, Operator, Prepare,
+    TableProviderFilterPushDown, TableSource, WindowFunctionDefinition,
 };
 
 use arrow::datatypes::{DataType, Field, Schema, SchemaRef};
@@ -262,11 +262,6 @@ pub enum LogicalPlan {
     /// Remove duplicate rows from the input. This is used to
     /// implement SQL `SELECT DISTINCT ...`.
     Distinct(Distinct),
-    /// Prepare a statement and find any bind parameters
-    /// (e.g. `?`). This is used to implement SQL-prepared statements.
-    Prepare(Prepare),
-    /// Execute a prepared statement. This is used to implement SQL 'EXECUTE'.
-    Execute(Execute),
     /// Data Manipulation Language (DML): Insert / Update / Delete
     Dml(DmlStatement),
     /// Data Definition Language (DDL): CREATE / DROP TABLES / VIEWS / SCHEMAS
@@ -314,8 +309,6 @@ impl LogicalPlan {
             LogicalPlan::Statement(statement) => statement.schema(),
             LogicalPlan::Subquery(Subquery { subquery, .. }) => subquery.schema(),
             LogicalPlan::SubqueryAlias(SubqueryAlias { schema, .. }) => schema,
-            LogicalPlan::Prepare(Prepare { input, .. }) => input.schema(),
-            LogicalPlan::Execute(Execute { schema, .. }) => schema,
             LogicalPlan::Explain(explain) => &explain.schema,
             LogicalPlan::Analyze(analyze) => &analyze.schema,
             LogicalPlan::Extension(extension) => extension.node.schema(),
@@ -448,18 +441,16 @@ impl LogicalPlan {
             LogicalPlan::Copy(copy) => vec![&copy.input],
             LogicalPlan::Ddl(ddl) => ddl.inputs(),
             LogicalPlan::Unnest(Unnest { input, .. }) => vec![input],
-            LogicalPlan::Prepare(Prepare { input, .. }) => vec![input],
             LogicalPlan::RecursiveQuery(RecursiveQuery {
                 static_term,
                 recursive_term,
                 ..
             }) => vec![static_term, recursive_term],
+            LogicalPlan::Statement(stmt) => stmt.inputs(),
             // plans without inputs
             LogicalPlan::TableScan { .. }
-            | LogicalPlan::Statement { .. }
             | LogicalPlan::EmptyRelation { .. }
             | LogicalPlan::Values { .. }
-            | LogicalPlan::Execute { .. }
             | LogicalPlan::DescribeTable(_) => vec![],
         }
     }
@@ -562,8 +553,6 @@ impl LogicalPlan {
             }
             LogicalPlan::Subquery(_) => Ok(None),
             LogicalPlan::EmptyRelation(_)
-            | LogicalPlan::Prepare(_)
-            | LogicalPlan::Execute(_)
             | LogicalPlan::Statement(_)
             | LogicalPlan::Values(_)
             | LogicalPlan::Explain(_)
@@ -715,8 +704,6 @@ impl LogicalPlan {
             LogicalPlan::RecursiveQuery(_) => Ok(self),
             LogicalPlan::Analyze(_) => Ok(self),
             LogicalPlan::Explain(_) => Ok(self),
-            LogicalPlan::Prepare(_) => Ok(self),
-            LogicalPlan::Execute(_) => Ok(self),
             LogicalPlan::TableScan(_) => Ok(self),
             LogicalPlan::EmptyRelation(_) => Ok(self),
             LogicalPlan::Statement(_) => Ok(self),
@@ -1070,24 +1057,25 @@ impl LogicalPlan {
                     logical_optimization_succeeded: e.logical_optimization_succeeded,
                 }))
             }
-            LogicalPlan::Prepare(Prepare {
-                name, data_types, ..
-            }) => {
+            LogicalPlan::Statement(Statement::Prepare(Prepare {
+                name,
+                data_types,
+                ..
+            })) => {
                 self.assert_no_expressions(expr)?;
                 let input = self.only_input(inputs)?;
-                Ok(LogicalPlan::Prepare(Prepare {
+                Ok(LogicalPlan::Statement(Statement::Prepare(Prepare {
                     name: name.clone(),
                     data_types: data_types.clone(),
                     input: Arc::new(input),
-                }))
+                })))
             }
-            LogicalPlan::Execute(Execute { name, schema, .. }) => {
+            LogicalPlan::Statement(Statement::Execute(Execute { name, .. })) => {
                 self.assert_no_inputs(inputs)?;
-                Ok(LogicalPlan::Execute(Execute {
+                Ok(LogicalPlan::Statement(Statement::Execute(Execute {
                     name: name.clone(),
-                    schema: Arc::clone(schema),
                     parameters: expr,
-                }))
+                })))
             }
             LogicalPlan::TableScan(ts) => {
                 self.assert_no_inputs(inputs)?;
@@ -1184,8 +1172,8 @@ impl LogicalPlan {
     /// Replaces placeholder param values (like `$1`, `$2`) in [`LogicalPlan`]
     /// with the specified `param_values`.
     ///
-    /// [`LogicalPlan::Prepare`] are
-    /// converted to their inner logical plan for execution.
+    /// [`Prepare`] statements are converted to
+    /// their inner logical plan for execution.
     ///
     /// # Example
     /// ```
@@ -1242,13 +1230,17 @@ impl LogicalPlan {
         let plan_with_values = self.replace_params_with_values(&param_values)?;
 
         // unwrap Prepare
-        Ok(if let LogicalPlan::Prepare(prepare_lp) = plan_with_values {
-            param_values.verify(&prepare_lp.data_types)?;
-            // try and take ownership of the input if is not shared, clone otherwise
-            Arc::unwrap_or_clone(prepare_lp.input)
-        } else {
-            plan_with_values
-        })
+        Ok(
+            if let LogicalPlan::Statement(Statement::Prepare(prepare_lp)) =
+                plan_with_values
+            {
+                param_values.verify(&prepare_lp.data_types)?;
+                // try and take ownership of the input if is not shared, clone otherwise
+                Arc::unwrap_or_clone(prepare_lp.input)
+            } else {
+                plan_with_values
+            },
+        )
     }
 
     /// Returns the maximum number of rows that this plan can output, if known.
@@ -1346,8 +1338,6 @@ impl LogicalPlan {
             | LogicalPlan::Dml(_)
             | LogicalPlan::Copy(_)
             | LogicalPlan::DescribeTable(_)
-            | LogicalPlan::Prepare(_)
-            | LogicalPlan::Execute(_)
             | LogicalPlan::Statement(_)
             | LogicalPlan::Extension(_) => None,
         }
@@ -1962,14 +1952,6 @@ impl LogicalPlan {
                     LogicalPlan::Analyze { .. } => write!(f, "Analyze"),
                     LogicalPlan::Union(_) => write!(f, "Union"),
                     LogicalPlan::Extension(e) => e.node.fmt_for_explain(f),
-                    LogicalPlan::Prepare(Prepare {
-                        name, data_types, ..
-                    }) => {
-                        write!(f, "Prepare: {name:?} {data_types:?} ")
-                    }
-                    LogicalPlan::Execute(Execute { name, parameters, .. }) => {
-                        write!(f, "Execute: {} params=[{}]", name, expr_vec_fmt!(parameters))
-                    }
                     LogicalPlan::DescribeTable(DescribeTable { .. }) => {
                         write!(f, "DescribeTable")
                     }
@@ -2624,39 +2606,6 @@ impl PartialOrd for Union {
     }
 }
 
-/// Prepare a statement but do not execute it. Prepare statements can have 0 or more
-/// `Expr::Placeholder` expressions that are filled in during execution
-#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Hash)]
-pub struct Prepare {
-    /// The name of the statement
-    pub name: String,
-    /// Data types of the parameters ([`Expr::Placeholder`])
-    pub data_types: Vec<DataType>,
-    /// The logical plan of the statements
-    pub input: Arc<LogicalPlan>,
-}
-
-/// Execute a prepared statement.
-#[derive(Debug, Clone, PartialEq, Eq, Hash)]
-pub struct Execute {
-    /// The name of the prepared statement to execute
-    pub name: String,
-    /// The execute parameters
-    pub parameters: Vec<Expr>,
-    /// Dummy schema
-    pub schema: DFSchemaRef,
-}
-
-// Comparison excludes the `schema` field.
-impl PartialOrd for Execute {
-    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
-        match self.name.partial_cmp(&other.name) {
-            Some(Ordering::Equal) => self.parameters.partial_cmp(&other.parameters),
-            cmp => cmp,
-        }
-    }
-}
-
 /// Describe the schema of table
 ///
 /// # Example output: