github.com/cockroachdb/cockroach@v20.2.0-alpha.1+incompatible/pkg/sql/rowexec/stats_test.go (about)

     1  // Copyright 2018 The Cockroach Authors.
     2  //
     3  // Use of this software is governed by the Business Source License
     4  // included in the file licenses/BSL.txt.
     5  //
     6  // As of the Change Date specified in that file, in accordance with
     7  // the Business Source License, use of this software will be governed
     8  // by the Apache License, Version 2.0, included in the file
     9  // licenses/APL.txt.
    10  
    11  package rowexec
    12  
    13  import (
    14  	"testing"
    15  
    16  	"github.com/cockroachdb/cockroach/pkg/sql/sqlbase"
    17  	"github.com/cockroachdb/cockroach/pkg/testutils/distsqlutils"
    18  	"github.com/cockroachdb/cockroach/pkg/util/leaktest"
    19  )
    20  
    21  // TestInputStatCollector verifies that an inputStatCollector correctly collects
    22  // stats from an input.
    23  func TestInputStatCollector(t *testing.T) {
    24  	defer leaktest.AfterTest(t)()
    25  
    26  	const numRows = 100
    27  
    28  	isc := newInputStatCollector(
    29  		distsqlutils.NewRowBuffer(sqlbase.OneIntCol, sqlbase.MakeIntRows(numRows, 1), distsqlutils.RowBufferArgs{}),
    30  	)
    31  	for row, meta := isc.Next(); row != nil || meta != nil; row, meta = isc.Next() {
    32  	}
    33  	if isc.NumRows != numRows {
    34  		t.Fatalf("counted %d rows but expected %d", isc.NumRows, numRows)
    35  	}
    36  }