* [highgo] Fix pgsql functions

db/pgsql_function.sql

@@ -238,4 +238,68 @@ CREATE OR REPLACE FUNCTION DATEDIFF(
 BEGIN
     RETURN (end_date - start_date)::INTEGER;
 END;
-$$ LANGUAGE plpgsql;
+$$ LANGUAGE plpgsql;
+
+--
+
+CREATE OR REPLACE FUNCTION IF(
+    condition BOOLEAN,
+    true_val DOUBLE PRECISION,
+    false_val INTEGER
+) RETURNS DOUBLE PRECISION AS $$
+BEGIN
+    IF condition THEN
+        RETURN true_val;
+    ELSE
+        RETURN false_val::DOUBLE PRECISION;
+    END IF;
+END;
+$$ LANGUAGE plpgsql;
+
+--
+
+CREATE OR REPLACE FUNCTION IF(
+    condition BOOLEAN,
+    true_val TEXT,
+    false_val DATE
+) RETURNS DATE AS $$
+BEGIN
+    IF condition THEN
+        RETURN true_val;
+    ELSE
+        RETURN false_val::DATE;
+    END IF;
+END;
+$$ LANGUAGE plpgsql;
+
+--
+
+CREATE OR REPLACE FUNCTION IF(
+    condition BOOLEAN,
+    true_val DATE,
+    false_val DATE
+) RETURNS DATE AS $$
+BEGIN
+    IF condition THEN
+        RETURN true_val;
+    ELSE
+        RETURN false_val;
+    END IF;
+END;
+$$ LANGUAGE plpgsql;
+
+--
+
+CREATE OR REPLACE FUNCTION IF(
+    condition BOOLEAN,
+    true_val  timestamp without time zone,
+    false_val DATE
+) RETURNS DATE AS $$
+BEGIN
+    IF condition THEN
+        RETURN true_val::DATE;
+    ELSE
+        RETURN false_val;
+    END IF;
+END;
+$$ LANGUAGE plpgsql;