From c92d29a42e95c2f4946ed65f15b7fc3ec7364ec4 Mon Sep 17 00:00:00 2001
From: Simon Vandel Sillesen <simon.vandel@gmail.com>
Date: Fri, 22 Aug 2025 22:17:25 +0200
Subject: [PATCH 1/3] Support from-first syntax

I noticed in https://github.com/apache/datafusion/pull/17278 that `from`
without an explicit projection did not work.
This should fix it
---
 datafusion/sql/src/select.rs                  |  9 ++++
 .../sqllogictest/test_files/from-first.slt    | 41 +++++++++++++++++++
 2 files changed, 50 insertions(+)
 create mode 100644 datafusion/sqllogictest/test_files/from-first.slt

diff --git a/datafusion/sql/src/select.rs b/datafusion/sql/src/select.rs
index c7ccda7232e2a..1a90e5e09b778 100644
--- a/datafusion/sql/src/select.rs
+++ b/datafusion/sql/src/select.rs
@@ -664,6 +664,15 @@ impl<S: ContextProvider> SqlToRel<'_, S> {
     ) -> Result<Vec<SelectExpr>> {
         let mut prepared_select_exprs = vec![];
         let mut error_builder = DataFusionErrorBuilder::new();
+
+        // Handle the case where no projection is specified but we have a valid FROM clause
+        // In this case, implicitly add a wildcard projection (SELECT *)
+        let projection = if projection.is_empty() && !empty_from {
+            vec![SelectItem::Wildcard(WildcardAdditionalOptions::default())]
+        } else {
+            projection
+        };
+
         for expr in projection {
             match self.sql_select_to_rex(expr, plan, empty_from, planner_context) {
                 Ok(expr) => prepared_select_exprs.push(expr),
diff --git a/datafusion/sqllogictest/test_files/from-first.slt b/datafusion/sqllogictest/test_files/from-first.slt
new file mode 100644
index 0000000000000..e35029b7768dc
--- /dev/null
+++ b/datafusion/sqllogictest/test_files/from-first.slt
@@ -0,0 +1,41 @@
+# 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.
+
+query I
+FROM range(2)
+----
+0
+1
+
+query I
+FROM range(2)
+SELECT *
+----
+0
+1
+
+query I
+FROM (SELECT * FROM range(2))
+----
+0
+1
+
+query I
+FROM (FROM range(2))
+----
+0
+1

From fe284b6f655deccf040cc4a65387032f83de6f6e Mon Sep 17 00:00:00 2001
From: Simon Vandel Sillesen <simon.vandel@gmail.com>
Date: Sat, 23 Aug 2025 13:47:04 +0200
Subject: [PATCH 2/3] add more tests

---
 datafusion/sqllogictest/test_files/from-first.slt | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/datafusion/sqllogictest/test_files/from-first.slt b/datafusion/sqllogictest/test_files/from-first.slt
index e35029b7768dc..c4a305e85ea77 100644
--- a/datafusion/sqllogictest/test_files/from-first.slt
+++ b/datafusion/sqllogictest/test_files/from-first.slt
@@ -39,3 +39,17 @@ FROM (FROM range(2))
 ----
 0
 1
+
+query I
+FROM range(2)
+SELECT 1
+----
+1
+1
+
+query I
+FROM range(2) as r
+SELECT r.value
+----
+0
+1

From 9f1b436a543dc1c34ed016e54678218ac9e73228 Mon Sep 17 00:00:00 2001
From: Simon Vandel Sillesen <simon.vandel@gmail.com>
Date: Sat, 23 Aug 2025 13:51:58 +0200
Subject: [PATCH 3/3] document in user guide

---
 docs/source/user-guide/sql/select.md | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/docs/source/user-guide/sql/select.md b/docs/source/user-guide/sql/select.md
index 39163cf492a4a..eb8bca7a75ef0 100644
--- a/docs/source/user-guide/sql/select.md
+++ b/docs/source/user-guide/sql/select.md
@@ -75,6 +75,20 @@ Example:
 SELECT t.a FROM table AS t
 ```
 
+The `FROM` clause can also come before the `SELECT` clause.
+Example:
+
+```sql
+FROM table AS t
+SELECT t.a
+```
+
+If the `SELECT` clause is omitted, the `FROM` clause will return all columns from the table.
+
+```sql
+FROM table
+```
+
 ## WHERE clause
 
 Example: