Jefffrey commented on code in PR #19311:
URL: https://github.com/apache/datafusion/pull/19311#discussion_r2645869751
##########
datafusion-examples/examples/relation_planner/main.rs:
##########
@@ -90,7 +90,7 @@ async fn main() -> Result<()> {
let example: ExampleKind = std::env::args()
.nth(1)
- .ok_or_else(|| DataFusionError::Execution(format!("Missing argument.
{usage}")))?
+ .unwrap_or_else(|| ExampleKind::All.to_string())
Review Comment:
This doesn't seem consistent with the other example groups
##########
datafusion/optimizer/src/simplify_expressions/simplify_sql_literal.rs:
##########
@@ -0,0 +1,253 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements. See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership. The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied. See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+//! Parses and simplifies a SQL expression to a literal of a given type.
+//!
+//! This module provides functionality to parse and simplify static SQL
expressions
+//! used in SQL constructs like `FROM TABLE SAMPLE (10 + 50 * 2)`. If they are
required
+//! in a planning (not an execution) phase, they need to be reduced to
literals of a given type.
+
+use crate::simplify_expressions::ExprSimplifier;
+use arrow::datatypes::DataType;
+use datafusion_common::{
+ DFSchemaRef, DataFusionError, Result, ScalarValue, plan_datafusion_err,
plan_err,
+};
+use datafusion_expr::Expr;
+use datafusion_expr::execution_props::ExecutionProps;
+use datafusion_expr::planner::RelationPlannerContext;
+use datafusion_expr::simplify::SimplifyContext;
+use datafusion_expr::sqlparser::ast;
+use std::sync::Arc;
+
+/// Parse and simplifies a SQL expression to a numeric literal of a given type
`T`.
+///
+/// This function simplifies and coerces the expression, then extracts the
underlying
+/// native type using `TryFrom<ScalarValue>`.
+///
+/// # Arguments
+/// * `expr` - A logical AST expression
+/// * `target_type` - Arrow type to cast the literal to
+/// * `schema` - Schema reference for expression planning
+/// * `context` - `RelationPlannerContext` context
+///
+/// # Returns
+/// A `Result` containing a literal type
+///
+/// # Example
+/// ```ignore
+/// let value: f64 = parse_sql_literal(&expr, &DataType::Float64, &schema,
&mut relPlannerContext)?;
+/// ```
+pub fn parse_sql_literal<T>(
+ expr: &ast::Expr,
+ target_type: &DataType,
+ schema: &DFSchemaRef,
+ context: &mut dyn RelationPlannerContext,
+) -> Result<T>
+where
+ T: TryFrom<ScalarValue, Error = DataFusionError>,
+{
+ match context.sql_to_expr(expr.clone(), &Arc::clone(schema)) {
Review Comment:
I do wonder if there's a way to compact this signature; for example, having
both `T` and `target_type` seem redundant since they'd need to be compatible
anyway, but off the top of my head I can't think of a way to combine them 🤔
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