qb: removed error from builder ToCql function

Builder is not in a position to validate the statement and the effort is
duplicated when the query is build. The checked errors are simple and
do not occur most of the time.

qb/delete.go

@@ -5,8 +5,6 @@ package qb
 
 import (
 	"bytes"
-	"errors"
-	"fmt"
 	"time"
 )
 
@@ -26,16 +24,7 @@ func Delete(table string) *DeleteBuilder {
 	}
 }
 
-func (b *DeleteBuilder) ToCql() (stmt string, names []string, err error) {
-	if b.table == "" {
-		err = errors.New("delete statements must specify a table")
-		return
-	}
-	if len(b.where) == 0 {
-		err = fmt.Errorf("delete statements must have at least one WHERE clause")
-		return
-	}
-
+func (b *DeleteBuilder) ToCql() (stmt string, names []string) {
 	cql := bytes.Buffer{}
 
 	cql.WriteString("DELETE ")

qb/delete_test.go

@@ -60,10 +60,7 @@ func TestDeleteBuilder(t *testing.T) {
 	}
 
 	for _, test := range table {
-		stmt, names, err := test.B.ToCql()
-		if err != nil {
-			t.Error("unexpected error", err)
-		}
+		stmt, names := test.B.ToCql()
 		if diff := cmp.Diff(test.S, stmt); diff != "" {
 			t.Error(diff)
 		}

qb/insert.go

@@ -5,7 +5,6 @@ package qb
 
 import (
 	"bytes"
-	"errors"
 	"time"
 )
 
@@ -23,17 +22,7 @@ func Insert(table string) *InsertBuilder {
 	}
 }
 
-func (b *InsertBuilder) ToCql() (stmt string, names []string, err error) {
-	if b.table == "" {
-		err = errors.New("insert statements must specify a table")
-		return
-	}
-
-	if len(b.columns) == 0 {
-		err = errors.New("insert statements must specify columns")
-		return
-	}
-
+func (b *InsertBuilder) ToCql() (stmt string, names []string) {
 	cql := bytes.Buffer{}
 
 	cql.WriteString("INSERT ")

qb/insert_test.go

@@ -53,10 +53,7 @@ func TestInsertBuilder(t *testing.T) {
 	}
 
 	for _, test := range table {
-		stmt, names, err := test.B.ToCql()
-		if err != nil {
-			t.Error("unexpected error", err)
-		}
+		stmt, names := test.B.ToCql()
 		if diff := cmp.Diff(test.S, stmt); diff != "" {
 			t.Error(diff)
 		}

qb/select.go

@@ -5,7 +5,6 @@ package qb
 
 import (
 	"bytes"
-	"errors"
 	"fmt"
 )
 
@@ -36,16 +35,7 @@ func Select(table string) *SelectBuilder {
 	}
 }
 
-func (b *SelectBuilder) ToCql() (stmt string, names []string, err error) {
-	if b.table == "" {
-		err = errors.New("select statements must specify a table")
-		return
-	}
-	if b.distinct != "" && len(b.columns) > 0 {
-		err = fmt.Errorf("select statements must specify either a column list or DISTINCT partition_key")
-		return
-	}
-
+func (b *SelectBuilder) ToCql() (stmt string, names []string) {
 	cql := bytes.Buffer{}
 
 	cql.WriteString("SELECT ")

qb/select_test.go

@@ -72,10 +72,7 @@ func TestSelectBuilder(t *testing.T) {
 	}
 
 	for _, test := range table {
-		stmt, names, err := test.B.ToCql()
-		if err != nil {
-			t.Error("unexpected error", err)
-		}
+		stmt, names := test.B.ToCql()
 		if diff := cmp.Diff(test.S, stmt); diff != "" {
 			t.Error(diff)
 		}

qb/update.go

@@ -2,8 +2,6 @@ package qb
 
 import (
 	"bytes"
-	"errors"
-	"fmt"
 )
 
 // UPDATE reference:
@@ -29,20 +27,7 @@ func Update(table string) *UpdateBuilder {
 	}
 }
 
-func (b *UpdateBuilder) ToCql() (stmt string, names []string, err error) {
-	if b.table == "" {
-		err = errors.New("update statements must specify a table")
-		return
-	}
-	if len(b.columns) == 0 {
-		err = fmt.Errorf("update statements must have at least one SET clause")
-		return
-	}
-	if len(b.where) == 0 {
-		err = fmt.Errorf("update statements must have at least one WHERE clause")
-		return
-	}
-
+func (b *UpdateBuilder) ToCql() (stmt string, names []string) {
 	cql := bytes.Buffer{}
 
 	cql.WriteString("UPDATE ")

qb/update_test.go

@@ -66,10 +66,7 @@ func TestUpdateBuilder(t *testing.T) {
 	}
 
 	for _, test := range table {
-		stmt, names, err := test.B.ToCql()
-		if err != nil {
-			t.Error("unexpected error", err)
-		}
+		stmt, names := test.B.ToCql()
 		if diff := cmp.Diff(test.S, stmt); diff != "" {
 			t.Error(diff)
 		}