refactor joinReferences

Author: vincentlauvlwj

ktorm-core/src/main/kotlin/org/ktorm/dsl/QuerySource.kt

@@ -131,13 +131,15 @@ public fun QuerySource.joinReferencesAndSelect(): Query {
         .select(joinedTables.flatMap { it.columns })
 }
 
-private fun BaseTable<*>.joinReferences(
-    querySource: QuerySource,
-    joinedTables: MutableList<BaseTable<*>>
-): QuerySource {
-
-    var curr = querySource
+/**
+ * Left join all reference tables and return a [QuerySource].
+ */
+private fun BaseTable<*>.joinReferences(result: QuerySource, joinedTables: MutableList<BaseTable<*>>): QuerySource {
+    infix fun ColumnDeclaring<*>.eq(column: ColumnDeclaring<*>): BinaryExpression<Boolean> {
+        return BinaryExpression(BinaryExpressionType.EQUAL, asExpression(), column.asExpression(), BooleanSqlType)
+    }
 
+    var curr = result
     joinedTables += this
 
     for (column in columns) {
@@ -156,7 +158,3 @@ private fun BaseTable<*>.joinReferences(
 
     return curr
 }
-
-private infix fun ColumnDeclaring<*>.eq(column: ColumnDeclaring<*>): BinaryExpression<Boolean> {
-    return BinaryExpression(BinaryExpressionType.EQUAL, asExpression(), column.asExpression(), BooleanSqlType)
-}