Add implicit cross join support

internal/jet/clause.go

@@ -45,19 +45,25 @@ func (s *ClauseSelect) Serialize(statementType StatementType, out *SQLBuilder, o
 
 // ClauseFrom struct
 type ClauseFrom struct {
-	Table Serializer
+	Tables []Serializer
 }
 
 // Serialize serializes clause into SQLBuilder
 func (f *ClauseFrom) Serialize(statementType StatementType, out *SQLBuilder, options ...SerializeOption) {
-	if f.Table == nil {
+	if len(f.Tables) == 0 { // SELECT statement does not have to have FROM clause
 		return
 	}
 	out.NewLine()
 	out.WriteString("FROM")
 
 	out.IncreaseIdent()
-	f.Table.serialize(statementType, out, FallTrough(options)...)
+	for i, table := range f.Tables {
+		if i > 0 {
+			out.WriteString(",")
+			out.NewLine()
+		}
+		table.serialize(statementType, out, FallTrough(options)...)
+	}
 	out.DecreaseIdent()
 }
 

internal/jet/table.go

@@ -136,9 +136,6 @@ func (t *joinTableImpl) TableName() string {
 	return ""
 }
 
-func (t *joinTableImpl) AS(alias string) {
-}
-
 func (t *joinTableImpl) columns() []Column {
 	var ret []Column
 

internal/testutils/test_utils.go

@@ -8,6 +8,7 @@ import (
 	"github.com/go-jet/jet/v2/internal/utils"
 	"github.com/go-jet/jet/v2/qrm"
 	"github.com/google/uuid"
+	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	"io/ioutil"
 	"os"
@@ -116,7 +117,12 @@ func AssertDebugStatementSql(t *testing.T, query jet.Statement, expectedQuery st
 	}
 
 	debuqSql := query.DebugSql()
-	require.Equal(t, debuqSql, expectedQuery)
+	if !assert.Equal(t, debuqSql, expectedQuery) {
+		fmt.Println("Expected: ")
+		fmt.Println(expectedQuery)
+		fmt.Println("Got: ")
+		fmt.Println(debuqSql)
+	}
 }
 
 // AssertSerialize checks if clause serialize produces expected query and args