Copy the latest pipelines tests into lite api pipelines tests. Fix a few minor bugs in the lite pipeline implementation

Author: MarkDuckworth

packages/firestore/lite/pipelines/pipelines.ts

@@ -160,6 +160,27 @@ export {
   timestampSubtract,
   ascending,
   descending,
+  arrayGet,
+  abs,
+  sum,
+  countDistinct,
+  ceil,
+  floor,
+  exp,
+  pow,
+  round,
+  collectionId,
+  ln,
+  log,
+  sqrt,
+  stringReverse,
+  log10,
+  concat,
+  currentTimestamp,
+  error,
+  ifAbsent,
+  join,
+  arraySum,
   AliasedExpression,
   Field,
   Constant,

packages/firestore/src/remote/datastore.ts

@@ -263,19 +263,17 @@ export async function invokeExecutePipeline(
   );
 
   const result: PipelineStreamElement[] = [];
-  response
-    .filter(proto => !!proto.results)
-    .forEach(proto => {
-      if (proto.results!.length === 0) {
-        result.push(fromPipelineResponse(datastoreImpl.serializer, proto));
-      } else {
-        return proto.results!.forEach(document =>
-          result.push(
-            fromPipelineResponse(datastoreImpl.serializer, proto, document)
-          )
-        );
-      }
-    });
+  response.forEach(proto => {
+    if (!proto.results || proto.results!.length === 0) {
+      result.push(fromPipelineResponse(datastoreImpl.serializer, proto));
+    } else {
+      return proto.results!.forEach(document =>
+        result.push(
+          fromPipelineResponse(datastoreImpl.serializer, proto, document)
+        )
+      );
+    }
+  });
 
   return result;
 }