vendor: update all dependencies to latest versions

vendor/cloud.google.com/go/bigtable/cmd/cbt/cbt.go

@@ -216,6 +216,13 @@ var commands = []struct {
 			"into multiple tablets. Can be repeated to create multiple splits.",
 		Required: cbtconfig.ProjectAndInstanceRequired,
 	},
+	{
+		Name:     "deletecolumn",
+		Desc:     "Delete all cells in a column",
+		do:       doDeleteColumn,
+		Usage:    "cbt deletecolumn <table> <row> <family> <column>",
+		Required: cbtconfig.ProjectAndInstanceRequired,
+	},
 	{
 		Name:     "deletefamily",
 		Desc:     "Delete a column family",
@@ -284,10 +291,12 @@ var commands = []struct {
 		Name: "read",
 		Desc: "Read rows",
 		do:   doRead,
-		Usage: "cbt read <table> [start=<row>] [end=<row>] [prefix=<prefix>] [count=<n>]\n" +
+		Usage: "cbt read <table> [start=<row>] [end=<row>] [prefix=<prefix>]" +
+			" [regex=<regex>] [count=<n>]\n" +
 			"  start=<row>		Start reading at this row\n" +
 			"  end=<row>		Stop reading before this row\n" +
 			"  prefix=<prefix>	Read rows with this prefix\n" +
+			"  regex=<regex> 	Read rows with keys matching this regex\n" +
 			"  count=<n>		Read only this many rows\n",
 		Required: cbtconfig.ProjectAndInstanceRequired,
 	},
@@ -365,6 +374,18 @@ func doCreateTable(ctx context.Context, args ...string) {
 	}
 }
 
+func doDeleteColumn(ctx context.Context, args ...string) {
+	if len(args) != 4 {
+		log.Fatal("usage: cbt deletecolumn <table> <row> <family> <column>")
+	}
+	tbl := getClient().Open(args[0])
+	mut := bigtable.NewMutation()
+	mut.DeleteCellsInColumn(args[2], args[3])
+	if err := tbl.Apply(ctx, args[1], mut); err != nil {
+		log.Fatalf("Deleting cells in column: %v", err)
+	}
+}
+
 func doDeleteFamily(ctx context.Context, args ...string) {
 	if len(args) != 2 {
 		log.Fatal("usage: cbt deletefamily <table> <family>")
@@ -474,7 +495,9 @@ var docTemplate = template.Must(template.New("doc").Funcs(template.FuncMap{
 //go:generate go run cbt.go -o cbtdoc.go doc
 
 /*
-Cbt is a tool for doing basic interactions with Cloud Bigtable.
+Cbt is a tool for doing basic interactions with Cloud Bigtable. To learn how to
+install the cbt tool, see the
+[cbt overview](https://cloud.google.com/bigtable/docs/go/cbt-overview).
 
 Usage:
 
@@ -672,7 +695,7 @@ func doRead(ctx context.Context, args ...string) {
 		case "limit":
 			// Be nicer; we used to support this, but renamed it to "end".
 			log.Fatalf("Unknown arg key %q; did you mean %q?", key, "end")
-		case "start", "end", "prefix", "count":
+		case "start", "end", "prefix", "count", "regex":
 			parsed[key] = val
 		}
 	}
@@ -698,6 +721,9 @@ func doRead(ctx context.Context, args ...string) {
 		}
 		opts = append(opts, bigtable.LimitRows(n))
 	}
+	if regex := parsed["regex"]; regex != "" {
+		opts = append(opts, bigtable.RowFilter(bigtable.RowKeyFilter(regex)))
+	}
 
 	// TODO(dsymonds): Support filters.
 	err := tbl.ReadRows(ctx, rr, func(r bigtable.Row) bool {