feat(schema-diff): preserve dialect-specific DDL semantics

crates/dbx-core/src/sql_dialect.rs

@@ -1,19 +1,77 @@
 mod capabilities;
+pub mod ddl_profile;
+pub mod descriptor;
+pub mod dialect_loader;
+pub mod dialect_types;
+pub mod dialect_yaml;
+pub mod hot_reload;
 mod identifiers;
+pub mod inference;
 mod table_select;
+pub mod type_rewrite;
 mod types;
 
 #[cfg(test)]
 mod tests;
 
+#[cfg(test)]
+mod descriptor_snapshots;
+
 pub use capabilities::{
     firebird_rows_clause, is_schema_aware, pagination_strategy, table_pagination_strategy, uses_fetch_first,
     uses_oracle_row_id, uses_single_row_insert_statements, PaginationContext, TablePaginationStrategy,
 };
+pub use ddl_profile::{
+    profile_for, AutoIncSyntax, DdlDialectProfile, IndexTypePlacement, QuoteStyle, RenameColumnSyntax, TriggerTemplate,
+    TypeMapEntry,
+};
+pub use descriptor::{
+    dialect_check, dialect_check_all, DialectCapabilityDescriptor, DialectInfo, DialectKind, TypeConversionRule,
+    TypeMappingMatrix, CAP_ADD_COLUMN, CAP_ALTER_EXISTING_COLUMN, CAP_ALTER_OWNER, CAP_ALTER_PRIMARY_KEY,
+    CAP_AUTO_INCREMENT, CAP_COMMENT, CAP_CREATE_FUNCTION, CAP_CREATE_INDEX, CAP_CREATE_OR_REPLACE, CAP_CREATE_SEQUENCE,
+    CAP_CREATE_TABLE, CAP_CREATE_TRIGGER, CAP_DROP_COLUMN, CAP_DROP_FUNCTION, CAP_DROP_INDEX, CAP_DROP_SEQUENCE,
+    CAP_DROP_TABLE, CAP_DROP_TRIGGER, CAP_FOREIGN_KEY, CAP_GRANT_REVOKE, CAP_IDENTITY_COLUMNS, CAP_IF_NOT_EXISTS,
+    CAP_INDEX_COMMENT, CAP_INDEX_FILTER, CAP_INDEX_INCLUDE, CAP_INDEX_TYPE, CAP_REBUILD_INDEX, CAP_RENAME_COLUMN,
+    CAP_REORDER_COLUMN, CAP_TEMPORARY_TABLE, CAP_TRANSACTIONAL_DDL, CAP_TRUNCATE_TABLE,
+};
 pub use identifiers::{
     normalize_where_input, qualified_table_name, qualified_table_name_with_catalog, quote_table_identifier,
 };
 pub(crate) use identifiers::{parse_sqlserver_linked_schema_ref, qualified_transfer_table, quote_transfer_identifier};
 pub use table_select::{build_count_table_sql, build_table_data_select_sql, build_table_select_sql};
 pub(crate) use table_select::{quote_table_data_identifier, table_data_qualified_table_name};
+pub use type_rewrite::{
+    apply_auto_inc_to_column_def, column_is_auto_increment, rewrite_column_type, split_type_base_params,
+    type_looks_integer, AutoIncColumnBuild,
+};
 pub use types::*;
+
+/// Resolve a dialect descriptor for the given kind.
+pub fn resolve(kind: descriptor::DialectKind) -> descriptor::DialectCapabilityDescriptor {
+    lazy_init();
+    if let Some(desc) = dialect_loader::DialectRegistry::global().get_descriptor(kind.label()) {
+        return desc;
+    }
+    descriptor::DialectCapabilityDescriptor::for_dialect(kind)
+}
+
+fn lazy_init() {
+    use std::sync::OnceLock;
+    static INIT: OnceLock<()> = OnceLock::new();
+    INIT.get_or_init(|| {
+        dialect_loader::register_core_dialects();
+        let _ = crate::dml_binding::DmlCleanRuleRegistry::load_default();
+    });
+}
+
+pub fn resolve_for_db(db_type: crate::models::connection::DatabaseType) -> descriptor::DialectCapabilityDescriptor {
+    let kind = descriptor::DialectKind::from_database_type(db_type);
+    resolve(kind)
+}
+
+pub fn resolve_label(kind: descriptor::DialectKind) -> String {
+    if let Some(loaded) = dialect_loader::DialectRegistry::global().get(kind.label()) {
+        return loaded.yaml.dialect.display_name.clone().unwrap_or_else(|| kind.label().to_string());
+    }
+    kind.label().to_string()
+}