Revert "chore(schema-compiler): remove Ramda from BaseGroupFilter"

This reverts commit 2437a0f.

Author: KSDaemon

packages/cubejs-schema-compiler/src/adapter/BaseGroupFilter.ts

@@ -1,3 +1,5 @@
+import R from 'ramda';
+
 export class BaseGroupFilter {
   protected readonly values: any;
 
@@ -29,7 +31,7 @@ export class BaseGroupFilter {
         return null;
       }
       return `(${sql})`;
-    }).filter(x => x).join(` ${this.operator.toUpperCase()} `);
+    }).filter(R.identity).join(` ${this.operator.toUpperCase()} `);
 
     if (!r.length) {
       return null;