feat: Add HAVING support to MySQL (#1806)

Author: kyleconroy

internal/endtoend/testdata/having/mysql/go/db.go

@@ -0,0 +1,10 @@
+CREATE TABLE weather (
+  city     text    NOT NULL,
+  temp_lo  integer NOT NULL
+);
+
+-- name: ColdCities :many
+SELECT city
+FROM weather
+GROUP BY city
+HAVING max(temp_lo) < ?;

internal/endtoend/testdata/having/mysql/go/models.go

@@ -0,0 +1,12 @@
+{
+	"version": "1",
+	"packages": [
+		{
+			"path": "go",
+			"engine": "mysql",
+			"name": "querytest",
+			"schema": "query.sql",
+			"queries": "query.sql"
+		}
+	]
+}

internal/endtoend/testdata/having/mysql/go/query.sql.go

@@ -0,0 +1,10 @@
+CREATE TABLE weather (
+  city     text    NOT NULL,
+  temp_lo  integer NOT NULL
+);
+
+-- name: ColdCities :many
+SELECT city
+FROM weather
+GROUP BY city
+HAVING max(temp_lo) < $1;

internal/endtoend/testdata/having/mysql/query.sql

@@ -0,0 +1,12 @@
+{
+	"version": "1",
+	"packages": [
+		{
+			"path": "go",
+			"engine": "postgresql",
+			"name": "querytest",
+			"schema": "query.sql",
+			"queries": "query.sql"
+		}
+	]
+}