Add SQLite "ON CONFLICT" column option in CREATE TABLE statements (#1442)

Co-authored-by: hulk <hulk.website@gmail.com>
Co-authored-by: Ifeanyi Ubah <ify1992@yahoo.com>

src/ast/ddl.rs

@@ -33,6 +33,7 @@ use crate::ast::{
     display_comma_separated, display_separated, DataType, Expr, Ident, MySQLColumnPosition,
     ObjectName, OrderByExpr, ProjectionSelect, SequenceOptions, SqlOption, Value,
 };
+use crate::keywords::Keyword;
 use crate::tokenizer::Token;
 
 /// An `ALTER TABLE` (`Statement::AlterTable`) operation
@@ -1186,6 +1187,9 @@ pub enum ColumnOption {
     /// ```
     /// [MS SQL Server]: https://learn.microsoft.com/en-us/sql/t-sql/statements/create-table-transact-sql-identity-property
     Identity(Option<IdentityProperty>),
+    /// SQLite specific: ON CONFLICT option on column definition
+    /// <https://www.sqlite.org/lang_conflict.html>
+    OnConflict(Keyword),
 }
 
 impl fmt::Display for ColumnOption {
@@ -1294,6 +1298,10 @@ impl fmt::Display for ColumnOption {
                 }
                 Ok(())
             }
+            OnConflict(keyword) => {
+                write!(f, "ON CONFLICT {:?}", keyword)?;
+                Ok(())
+            }
         }
     }
 }

src/parser/mod.rs

@@ -6224,6 +6224,19 @@ impl<'a> Parser<'a> {
                 None
             };
             Ok(Some(ColumnOption::Identity(property)))
+        } else if dialect_of!(self is SQLiteDialect | GenericDialect)
+            && self.parse_keywords(&[Keyword::ON, Keyword::CONFLICT])
+        {
+            // Support ON CONFLICT for SQLite
+            Ok(Some(ColumnOption::OnConflict(
+                self.expect_one_of_keywords(&[
+                    Keyword::ROLLBACK,
+                    Keyword::ABORT,
+                    Keyword::FAIL,
+                    Keyword::IGNORE,
+                    Keyword::REPLACE,
+                ])?,
+            )))
         } else {
             Ok(None)
         }