feat: support select with KClass (#825)

Author: minsujang0

dsl/jpql/src/main/kotlin/com/linecorp/kotlinjdsl/dsl/jpql/Jpql.kt

@@ -3105,6 +3105,21 @@ open class Jpql : JpqlDsl {
         return SortDsl(this.toExpression(), Sort.Order.DESC)
     }
 
+    /**
+     * Creates a select clause in a select query.
+     */
+    @SinceJdsl("3.0.0")
+    fun <T : Any> select(
+        type: KClass<T>,
+        expr: Expressionable<T>,
+    ): SelectQueryFromStep<T> {
+        return SelectQueryFromStepDsl(
+            type,
+            distinct = false,
+            listOf(expr.toExpression()),
+        )
+    }
+
     /**
      * Creates a select clause in a select query.
      */
@@ -3119,6 +3134,22 @@ open class Jpql : JpqlDsl {
         )
     }
 
+    /**
+     * Creates a select clause in a select query.
+     */
+    @SinceJdsl("3.0.0")
+    fun <T : Any> select(
+        type: KClass<T>,
+        expr: Expressionable<*>,
+        vararg exprs: Expressionable<*>,
+    ): SelectQueryFromStep<T> {
+        return SelectQueryFromStepDsl(
+            type,
+            distinct = false,
+            listOf(expr.toExpression()) + exprs.map { it.toExpression() },
+        )
+    }
+
     /**
      * Creates a select clause in a select query.
      */
@@ -3134,6 +3165,21 @@ open class Jpql : JpqlDsl {
         )
     }
 
+    /**
+     * Creates a select clause in a select query.
+     */
+    @SinceJdsl("3.0.0")
+    fun <T : Any> selectDistinct(
+        type: KClass<T>,
+        expr: Expressionable<T>,
+    ): SelectQueryFromStep<T> {
+        return SelectQueryFromStepDsl(
+            type,
+            distinct = true,
+            listOf(expr.toExpression()),
+        )
+    }
+
     /**
      * Creates a select clause in a select query.
      */
@@ -3148,6 +3194,22 @@ open class Jpql : JpqlDsl {
         )
     }
 
+    /**
+     * Creates a select clause in a select query.
+     */
+    @SinceJdsl("3.0.0")
+    fun <T : Any> selectDistinct(
+        type: KClass<T>,
+        expr: Expressionable<*>,
+        vararg exprs: Expressionable<*>,
+    ): SelectQueryFromStep<T> {
+        return SelectQueryFromStepDsl(
+            type,
+            distinct = true,
+            listOf(expr.toExpression()) + exprs.map { it.toExpression() },
+        )
+    }
+
     /**
      * Creates a select clause in a select query.
      */
@@ -3163,6 +3225,27 @@ open class Jpql : JpqlDsl {
         )
     }
 
+    /**
+     * Creates a select clause with the DTO projection in a select query.
+     */
+    @SinceJdsl("3.0.0")
+    fun <T : Any> selectNew(
+        type: KClass<T>,
+        expr: Expressionable<*>,
+        vararg exprs: Expressionable<*>,
+    ): SelectQueryFromStep<T> {
+        return SelectQueryFromStepDsl(
+            returnType = type,
+            distinct = false,
+            select = listOf(
+                Expressions.new(
+                    type,
+                    listOf(expr.toExpression()) + exprs.map { it.toExpression() },
+                ),
+            ),
+        )
+    }
+
     /**
      * Creates a select clause with the DTO projection in a select query.
      */
@@ -3183,6 +3266,27 @@ open class Jpql : JpqlDsl {
         )
     }
 
+    /**
+     * Creates a select clause with the DTO projection in a select query.
+     */
+    @SinceJdsl("3.0.0")
+    fun <T : Any> selectDistinctNew(
+        type: KClass<T>,
+        expr: Expressionable<*>,
+        vararg exprs: Expressionable<*>,
+    ): SelectQueryFromStep<T> {
+        return SelectQueryFromStepDsl(
+            returnType = type,
+            distinct = true,
+            select = listOf(
+                Expressions.new(
+                    type,
+                    listOf(expr.toExpression()) + exprs.map { it.toExpression() },
+                ),
+            ),
+        )
+    }
+
     /**
      * Creates a select clause with the DTO projection in a select query.
      */