Add Sqlite On Conflict column option in create table statements

Author: TylerBrinks

src/SqlParser.Tests/Dialects/SqliteDialectTests.cs

@@ -285,4 +285,23 @@ public void Test_Dollar_Identifier_As_Placeholder()
         Assert.Equal(new Identifier("id"), expression.Left);
         Assert.Equal(new LiteralValue(new Value.Placeholder("$id")), expression.Right);
     }
+
+    [Fact]
+    public void Parse_Create_Table_On_Conflict_Col()
+    {
+        foreach (var keyword in new[]{Keyword.ROLLBACK, Keyword.ABORT, Keyword.FAIL, Keyword.IGNORE, Keyword.REPLACE})
+        {
+            var sql = $"CREATE TABLE t1 (a INT, b INT ON CONFLICT {keyword})";
+
+            var create = VerifiedStatement<Statement.CreateTable>(sql);
+
+            Assert.Equal([new ColumnOptionDef(new ColumnOption.OnConflict(keyword))], create.Element.Columns[1].Options);
+        }
+    }
+
+    [Fact]
+    public void Test_Parse_Create_Table_On_Conflict_Col_Err()
+    {
+        Assert.Throws<ParserException>(() => ParseSqlStatements("CREATE TABLE t1 (a INT, b INT ON CONFLICT BOH)"));
+    }
 }

src/SqlParser/Ast/ColumnOption.cs

@@ -237,6 +237,14 @@ public override void ToSql(SqlTextWriter writer)
             writer.WriteSql($"ON UPDATE {Expression}");
         }
     }
+
+    public record OnConflict(Keyword Keyword) : ColumnOption
+    {
+        public override void ToSql(SqlTextWriter writer)
+        {
+            writer.WriteSql($"ON CONFLICT {Keyword.ToString().ToUpperInvariant()}");
+        }
+    }
     /// <summary>
     /// Generated are modifiers that follow a column definition in a CREATE TABLE statement.
     /// </summary>

src/SqlParser/Parser.cs

@@ -2404,6 +2404,11 @@ or Keyword.GENERATED
             return new ColumnOption.Identity(property);
         }
 
+        if(_dialect is SQLiteDialect or GenericDialect && ParseKeywordSequence(Keyword.ON, Keyword.CONFLICT))
+        {
+            return new ColumnOption.OnConflict(ExpectOneOfKeywords(Keyword.ROLLBACK, Keyword.ABORT, Keyword.FAIL, Keyword.IGNORE, Keyword.REPLACE));
+        }
+
         return null;
     }