duckdb: fix unknown column error for the rowid pseudo-column

internal/endtoend/testdata/duckdb_rowid/duckdb/exec.json

@@ -0,0 +1,3 @@
+{
+  "contexts": ["base"]
+}

internal/endtoend/testdata/duckdb_rowid/duckdb/query.sql

@@ -0,0 +1,17 @@
+-- name: WithRowID :many
+SELECT rowid, id FROM plan;
+
+-- name: WithQualifiedRowID :many
+SELECT p.rowid, p.id FROM plan p;
+
+-- name: ByRowID :one
+SELECT id FROM plan WHERE rowid = $1;
+
+-- name: OrderByRowID :many
+SELECT id FROM plan ORDER BY rowid;
+
+-- name: StarSkipsRowID :many
+SELECT * FROM plan;
+
+-- name: DeclaredRowID :many
+SELECT rowid, name FROM tag;

internal/endtoend/testdata/duckdb_rowid/duckdb/schema.sql

@@ -0,0 +1,10 @@
+CREATE TABLE plan (
+    id UUID NOT NULL,
+    ship_size VARCHAR NOT NULL,
+    price DOUBLE
+);
+
+CREATE TABLE tag (
+    rowid VARCHAR NOT NULL,
+    name VARCHAR NOT NULL
+);

internal/endtoend/testdata/duckdb_rowid/duckdb/sqlc.yaml

@@ -0,0 +1,10 @@
+version: "2"
+sql:
+  - engine: "duckdb"
+    schema: "schema.sql"
+    queries: "query.sql"
+    gen:
+      go:
+        package: "querytest"
+        out: "go"
+        sql_package: "database/sql"

internal/engine/duckdb/convert.go

@@ -1061,6 +1061,25 @@ func (c *cc) convertCreateTableInfo(info *dw.CreateTableInfo) ast.Node {
 	for i := range info.Columns {
 		stmt.Cols = append(stmt.Cols, c.convertColumnDef(&info.Columns[i], primaryKey))
 	}
+
+	// Every base table also has a rowid pseudo-column. It is a nullable
+	// BIGINT that queries can select, filter and sort on, but it is not part
+	// of the table's columns. A column the table declares as rowid takes
+	// precedence.
+	hasRowID := false
+	for _, col := range stmt.Cols {
+		if col.Colname == "rowid" {
+			hasRowID = true
+			break
+		}
+	}
+	if !hasRowID {
+		stmt.Cols = append(stmt.Cols, &ast.ColumnDef{
+			Colname:  "rowid",
+			IsHidden: true,
+			TypeName: &ast.TypeName{Name: "bigint"},
+		})
+	}
 	return stmt
 }