PgSQL: Add support for DateConstruct/TimeConstruct functions

Author: alex-kulakov

Orm/Xtensive.Orm.PostgreSql/Sql.Drivers.PostgreSql/v8_0/Compiler.cs

@@ -18,6 +18,8 @@ internal class Compiler : SqlCompiler
     private static readonly SqlNative OneYearInterval = SqlDml.Native("interval '1 year'");
     private static readonly SqlNative OneMonthInterval = SqlDml.Native("interval '1 month'");
     private static readonly SqlNative OneDayInterval = SqlDml.Native("interval '1 day'");
+
+    private static readonly SqlNative OneHourInterval = SqlDml.Native("interval '1 hour'");
     private static readonly SqlNative OneMinuteInterval = SqlDml.Native("interval '1 minute'");
     private static readonly SqlNative OneSecondInterval = SqlDml.Native("interval '1 second'");
 
@@ -106,6 +108,21 @@ public override void Visit(SqlFunctionCall node)
                          + (OneDayInterval * (node.Arguments[2] - 1));
           newNode.AcceptVisitor(this);
           return;
+#if NET6_0_OR_GREATER //DO_DATEONLY
+        case SqlFunctionType.DateConstruct:
+          (SqlDml.Literal(new DateOnly(2001, 1, 1))
+            + (OneYearInterval * (node.Arguments[0] - 2001))
+            + (OneMonthInterval * (node.Arguments[1] - 1))
+            + (OneDayInterval * (node.Arguments[2] - 1))).AcceptVisitor(this);
+          return;
+        case SqlFunctionType.TimeConstruct: {
+          ((SqlDml.Literal(new TimeOnly(0, 0, 0))
+            + (OneHourInterval * (node.Arguments[0]))
+            + (OneMinuteInterval * (node.Arguments[1]))
+            + (OneSecondInterval * (node.Arguments[2] + (SqlDml.Cast(node.Arguments[3], SqlType.Double) / 1000))))).AcceptVisitor(this);
+          return;
+        }
+#endif
         case SqlFunctionType.DateTimeTruncate:
           (SqlDml.FunctionCall("date_trunc", "day", node.Arguments[0])).AcceptVisitor(this);
           return;

Orm/Xtensive.Orm.PostgreSql/Sql.Drivers.PostgreSql/v8_0/Translator.cs

@@ -1,4 +1,4 @@
-// Copyright (C) 2012-2022 Xtensive LLC.
+// Copyright (C) 2012-2023 Xtensive LLC.
 // This code is distributed under MIT license terms.
 // See the License.txt file in the project root for more information.
 
@@ -53,6 +53,14 @@ public SqlFunctionTypeTranslations(int count)
 
     /// <inheritdoc/>
     public override string DateTimeFormatString => @"\'yyyyMMdd HHmmss.ffffff\''::timestamp(6)'";
+#if NET6_0_OR_GREATER //DO_DATEONLY
+
+    /// <inheritdoc/>
+    public override string DateOnlyFormatString => @"\'yyyyMMdd\''::date'";
+
+    /// <inheritdoc/>
+    public override string TimeOnlyFormatString => @"\'HH:mm:ss.ffffff\''::time'";
+#endif
 
     /// <inheritdoc/>
     public override string TimeSpanFormatString => "'{0}{1} days {0}{2}:{3}:{4}.{5:000}'::interval";