Fixed insert not being able to return a single column

Author: wickwirew

Sources/Compiler/Sema/StmtTypeChecker.swift

@@ -543,7 +543,7 @@ extension StmtTypeChecker {
             return .empty
         }
 
-        usedTableNames.insert(table.name.name)
+        importTable(table)
 
         // If there is an error upstream that will cause unification to fail for sure
         // we can just skip it so the real error does not get hidden by all the other errors

Tests/CompilerTests/Compiler/CompileInsert.sql

@@ -158,3 +158,12 @@ INSERT INTO user (id, name) VALUES (?, ?)
 ON CONFLICT (id) DO UPDATE
 SET name = excluded.name
 WHERE excluded.name = 'bob';
+
+-- CHECK: SIGNATURE
+-- CHECK:   OUTPUT_CHUNKS
+-- CHECK:     CHUNK
+-- CHECK:       OUTPUT
+-- CHECK:         id INTEGER
+-- CHECK:   TABLES
+-- CHECK:     user
+INSERT INTO user (name) VALUES ('joe') RETURNING id;

Tests/CompilerTests/CompilerTests.swift

@@ -19,7 +19,7 @@ class CompilerTests: XCTestCase {
     }
 
     func testInsert() throws {
-        try checkQueries(compile: "CompileInsert")
+        try checkQueries(compile: "CompileInsert", dump: true)
     }
 
     func testUpdate() throws {