From 1821c562f7572475033f086a20695eac8e908799 Mon Sep 17 00:00:00 2001
From: Tomasz Sowa <t.sowa@ttmath.org>
Date: Tue, 28 Feb 2023 03:37:20 +0100
Subject: [PATCH] add a Select::distinct flag

---
 src/finder.h | 12 +++++++++---
 src/select.h |  8 +++++++-
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/src/finder.h b/src/finder.h
index 624b0fa..d85b737 100644
--- a/src/finder.h
+++ b/src/finder.h
@@ -5,7 +5,7 @@
  */
 
 /*
- * Copyright (c) 2018-2022, Tomasz Sowa
+ * Copyright (c) 2018-2023, Tomasz Sowa
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -170,7 +170,7 @@ public:
 
 		if( !select_flags.is_no_auto_generated_columns() )
 		{
-			generate_standard_select();
+			generate_standard_select(select_flags);
 		}
 
 		return *this;
@@ -1234,13 +1234,19 @@ protected:
 	}
 
 
-	virtual void generate_standard_select()
+	virtual void generate_standard_select(const Select & select_flags)
 	{
 		if( model_connector && out_stream && db_expression && model.model_env )
 		{
 			model.model_env->has_autogenerated_select = true;
 
 			(*out_stream) << "SELECT ";
+
+			if( select_flags.is_distinct() )
+			{
+				(*out_stream) << "DISTINCT ";
+			}
+
 			model.generate_select_columns(*out_stream);
 			(*out_stream) << " FROM ";
 
diff --git a/src/select.h b/src/select.h
index ec8258d..f376c7f 100644
--- a/src/select.h
+++ b/src/select.h
@@ -5,7 +5,7 @@
  */
 
 /*
- * Copyright (c) 2022, Tomasz Sowa
+ * Copyright (c) 2022-2023, Tomasz Sowa
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -50,6 +50,7 @@ public:
 		default_type = 0,
 		no_auto_generated_columns = 1,
 		with_rows_counter = 2,
+		distinct = 4,
 	};
 
 
@@ -117,6 +118,11 @@ public:
 	}
 
 
+	bool is_distinct() const
+	{
+		return is_flag_set(distinct);
+	}
+
 };
 
 }