Validation with 0 rows in response

[illia-li]

In 'Check' function have no difference processing with cases then in response 0 rows or some rows:

func (ds delegatingStore) Check(ctx context.Context, table *typedef.Table, builder qb.Builder, values ...interface{}) error {
	testRows, err := load(ctx, ds.testStore, builder, values)
...
	oracleRows, err := load(ctx, ds.oracleStore, builder, values)
...
	if len(testRows) != len(oracleRows) {
...
	}

I was build in 'Check' function atomic counter for responses with 0 rows :

	if len(testRows) == 0 && len(oracleRows) == 0 {
		utils.NilRows.Add(1)
	}

And run usual test. Results:
Write Operations: 135611
Read Operations: 129290
Nil Rows Counter: 116810

Then I ran a test for each function from GenCheckStmt. Here are the results for each of them:

genSinglePartitionQuery:
Write Operations: 183150
Read Operations: 156343
Nil Rows Counter: 31010

genMultiplePartitionQuery:
Write Operations: 158734
Read Operations: 154572
Nil Rows Counter: 154572

genClusteringRangeQuery:
Write Operations: 165392
Read Operations: 174523
Nil Rows Counter: 167365

genMultiplePartitionClusteringRangeQuery:
Write Operations: 170090
Read Operations: 169189
Nil Rows Counter: 158099

genSingleIndexQuery:
Write Operations: 87691
Read Operations: 5870
Read Errors : 241
Nil Rows Counter: 5870