datafusion 41.0.0

DataFusion is an in-memory query engine that uses Apache Arrow as the memory model
Documentation 
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// 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.

//! DataFusion data sources: [`TableProvider`] and [`ListingTable`]
//!
//! [`ListingTable`]: crate::datasource::listing::ListingTable

pub mod avro_to_arrow;
pub mod cte_worktable;
pub mod default_table_source;
pub mod empty;
pub mod file_format;
pub mod function;
pub mod listing;
pub mod listing_table_factory;
pub mod memory;
pub mod physical_plan;
pub mod provider;
pub mod schema_adapter;
mod statistics;
pub mod stream;
pub mod streaming;
pub mod view;

// backwards compatibility
pub use datafusion_execution::object_store;

pub use self::default_table_source::{
    provider_as_source, source_as_provider, DefaultTableSource,
};
pub use self::memory::MemTable;
pub use self::view::ViewTable;
pub use crate::catalog::TableProvider;
pub use crate::logical_expr::TableType;
pub use statistics::get_statistics_with_limit;

use arrow_schema::{Schema, SortOptions};
use datafusion_common::{plan_err, Result};
use datafusion_expr::Expr;
use datafusion_physical_expr::{expressions, LexOrdering, PhysicalSortExpr};

fn create_ordering(
    schema: &Schema,
    sort_order: &[Vec<Expr>],
) -> Result<Vec<LexOrdering>> {
    let mut all_sort_orders = vec![];

    for exprs in sort_order {
        // Construct PhysicalSortExpr objects from Expr objects:
        let mut sort_exprs = vec![];
        for expr in exprs {
            match expr {
                Expr::Sort(sort) => match sort.expr.as_ref() {
                    Expr::Column(col) => match expressions::col(&col.name, schema) {
                        Ok(expr) => {
                            sort_exprs.push(PhysicalSortExpr {
                                expr,
                                options: SortOptions {
                                    descending: !sort.asc,
                                    nulls_first: sort.nulls_first,
                                },
                            });
                        }
                        // Cannot find expression in the projected_schema, stop iterating
                        // since rest of the orderings are violated
                        Err(_) => break,
                    }
                    expr => return plan_err!("Expected single column references in output_ordering, got {expr}"),
                }
                expr => return plan_err!("Expected Expr::Sort in output_ordering, but got {expr}"),
            }
        }
        if !sort_exprs.is_empty() {
            all_sort_orders.push(sort_exprs);
        }
    }
    Ok(all_sort_orders)
}