fix: fix type mismatch of compressed_binary column in function table (#…

…17312)

src/meta/model_v2/migration/src/lib.rs

@@ -12,6 +12,7 @@ mod m20240418_142249_function_runtime;
 mod m20240506_112555_subscription_partial_ckpt;
 mod m20240525_090457_secret;
 mod m20240617_070131_index_column_properties;
+mod m20240618_072634_function_compressed_binary;
 
 pub struct Migrator;
 
@@ -28,6 +29,7 @@ impl MigratorTrait for Migrator {
             Box::new(m20240418_142249_function_runtime::Migration),
             Box::new(m20240506_112555_subscription_partial_ckpt::Migration),
             Box::new(m20240525_090457_secret::Migration),
+            Box::new(m20240618_072634_function_compressed_binary::Migration),
             Box::new(m20240617_070131_index_column_properties::Migration),
         ]
     }

src/meta/model_v2/migration/src/m20240618_072634_function_compressed_binary.rs

@@ -0,0 +1,74 @@
+use sea_orm_migration::prelude::*;
+
+use crate::sea_orm::{DatabaseBackend, DbBackend, Statement};
+
+#[derive(DeriveMigrationName)]
+pub struct Migration;
+
+#[async_trait::async_trait]
+impl MigrationTrait for Migration {
+    async fn up(&self, manager: &SchemaManager) -> Result<(), DbErr> {
+        // Fix mismatch column `compressed_binary` type and do data migration
+        match manager.get_database_backend() {
+            DbBackend::MySql => {
+                // Creating function with compressed binary will fail in previous version, so we can
+                // safely assume that the column is always empty and we can just modify the column type
+                // without any data migration.
+                manager
+                    .alter_table(
+                        Table::alter()
+                            .table(Function::Table)
+                            .modify_column(
+                                ColumnDef::new(Function::CompressedBinary).blob(BlobSize::Medium),
+                            )
+                            .to_owned(),
+                    )
+                    .await?;
+            }
+            DbBackend::Postgres => {
+                manager.get_connection().execute(Statement::from_string(
+                    DatabaseBackend::Postgres,
+                    "ALTER TABLE function ALTER COLUMN compressed_binary TYPE bytea USING compressed_binary::bytea",
+                )).await?;
+            }
+            DbBackend::Sqlite => {
+                // Sqlite does not support modifying column type, so we need to do data migration and column renaming.
+                // Note that: all these DDLs are not transactional, so if some of them fail, we need to manually run it again.
+                let conn = manager.get_connection();
+                conn.execute(Statement::from_string(
+                    DatabaseBackend::Sqlite,
+                    "ALTER TABLE function ADD COLUMN compressed_binary_new BLOB",
+                ))
+                .await?;
+                conn.execute(Statement::from_string(
+                    DatabaseBackend::Sqlite,
+                    "UPDATE function SET compressed_binary_new = compressed_binary",
+                ))
+                .await?;
+                conn.execute(Statement::from_string(
+                    DatabaseBackend::Sqlite,
+                    "ALTER TABLE function DROP COLUMN compressed_binary",
+                ))
+                .await?;
+                conn.execute(Statement::from_string(
+                    DatabaseBackend::Sqlite,
+                    "ALTER TABLE function RENAME COLUMN compressed_binary_new TO compressed_binary",
+                ))
+                .await?;
+            }
+        }
+
+        Ok(())
+    }
+
+    async fn down(&self, _manager: &SchemaManager) -> Result<(), DbErr> {
+        // DO nothing, the operations in `up` are idempotent and required to fix the column type mismatch.
+        Ok(())
+    }
+}
+
+#[derive(DeriveIden)]
+enum Function {
+    Table,
+    CompressedBinary,
+}