qb: tuples now returns the correct names

The names are auto generated in the form param_0, param_1, ...

qb/value.go

@@ -4,7 +4,10 @@
 
 package qb
 
-import "bytes"
+import (
+	"bytes"
+	"strconv"
+)
 
 // value is a CQL value expression for use in an initializer, assignment,
 // or comparison.
@@ -29,14 +32,18 @@ type tupleParam struct {
 }
 
 func (t tupleParam) writeCql(cql *bytes.Buffer) (names []string) {
+	baseName := string(t.param) + "_"
 	cql.WriteByte('(')
 	for i := 0; i < t.count-1; i++ {
 		cql.WriteByte('?')
 		cql.WriteByte(',')
+		names = append(names, baseName+strconv.Itoa(i))
 	}
 	cql.WriteByte('?')
 	cql.WriteByte(')')
-	return []string{string(t.param)}
+	names = append(names, baseName+strconv.Itoa(t.count-1))
+
+	return
 }
 
 // lit is a literal CQL value.