fix #240: ILIKE is supported by ClickHouse but not Sqlite

Author: huandu

cond.go

@@ -254,7 +254,7 @@ func (c *Cond) ILike(field string, value interface{}) string {
 	return c.Var(condBuilder{
 		Builder: func(ctx *argsCompileContext) {
 			switch ctx.Flavor {
-			case PostgreSQL, SQLite:
+			case PostgreSQL, ClickHouse:
 				ctx.WriteString(field)
 				ctx.WriteString(" ILIKE ")
 				ctx.WriteValue(value)
@@ -299,7 +299,7 @@ func (c *Cond) NotILike(field string, value interface{}) string {
 	return c.Var(condBuilder{
 		Builder: func(ctx *argsCompileContext) {
 			switch ctx.Flavor {
-			case PostgreSQL, SQLite:
+			case PostgreSQL, ClickHouse:
 				ctx.WriteString(field)
 				ctx.WriteString(" NOT ILIKE ")
 				ctx.WriteValue(value)

cond_test.go

@@ -188,13 +188,17 @@ f4 IS NOT DISTINCT FROM $4`,
 LOWER(f2) NOT LIKE LOWER(?)
 NOT f3 <=> ?
 f4 <=> ?`,
-		SQLite: `f1 ILIKE ?
-f2 NOT ILIKE ?
+		SQLite: `LOWER(f1) LIKE LOWER(?)
+LOWER(f2) NOT LIKE LOWER(?)
 f3 IS DISTINCT FROM ?
 f4 IS NOT DISTINCT FROM ?`,
 		Presto: `LOWER(f1) LIKE LOWER(?)
 LOWER(f2) NOT LIKE LOWER(?)
 CASE WHEN f3 IS NULL AND ? IS NULL THEN 0 WHEN f3 IS NOT NULL AND ? IS NOT NULL AND f3 = ? THEN 0 ELSE 1 END = 1
+CASE WHEN f4 IS NULL AND ? IS NULL THEN 1 WHEN f4 IS NOT NULL AND ? IS NOT NULL AND f4 = ? THEN 1 ELSE 0 END = 1`,
+		ClickHouse: `f1 ILIKE ?
+f2 NOT ILIKE ?
+CASE WHEN f3 IS NULL AND ? IS NULL THEN 0 WHEN f3 IS NOT NULL AND ? IS NOT NULL AND f3 = ? THEN 0 ELSE 1 END = 1
 CASE WHEN f4 IS NULL AND ? IS NULL THEN 1 WHEN f4 IS NOT NULL AND ? IS NOT NULL AND f4 = ? THEN 1 ELSE 0 END = 1`,
 	}