Add EXPLAIN plan visualization with diagram, tree, and raw views

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 
 - Maintenance tools via table context menu (VACUUM, ANALYZE, OPTIMIZE, REINDEX, CHECK TABLE, etc.)
+- EXPLAIN plan visualization with diagram, tree, and raw views (PostgreSQL, MySQL)
 
 ### Fixed
 

Plugins/MySQLDriverPlugin/MySQLPlugin.swift

@@ -28,6 +28,9 @@ final class MySQLPlugin: NSObject, TableProPlugin, DriverPlugin {
     // MARK: - UI/Capability Metadata
 
     static let urlSchemes: [String] = ["mysql"]
+    static let explainVariants: [ExplainVariant] = [
+        ExplainVariant(id: "explain", label: "EXPLAIN", sqlPrefix: "EXPLAIN FORMAT=JSON"),
+    ]
     static let brandColorHex = "#FF9500"
     static let systemDatabaseNames: [String] = ["information_schema", "mysql", "performance_schema", "sys"]
     static let columnTypesByCategory: [String: [String]] = [

Plugins/PostgreSQLDriverPlugin/PostgreSQLPlugin.swift

@@ -39,6 +39,10 @@ final class PostgreSQLPlugin: NSObject, TableProPlugin, DriverPlugin {
     static let brandColorHex = "#336791"
     static let systemDatabaseNames: [String] = ["postgres", "template0", "template1"]
     static let supportsSchemaSwitching = true
+    static let explainVariants: [ExplainVariant] = [
+        ExplainVariant(id: "explain", label: "EXPLAIN", sqlPrefix: "EXPLAIN (FORMAT JSON)"),
+        ExplainVariant(id: "analyze", label: "EXPLAIN ANALYZE", sqlPrefix: "EXPLAIN (ANALYZE, FORMAT JSON)"),
+    ]
     static let databaseGroupingStrategy: GroupingStrategy = .bySchema
     static let columnTypesByCategory: [String: [String]] = [
         "Integer": ["SMALLINT", "INTEGER", "BIGINT", "SERIAL", "BIGSERIAL", "SMALLSERIAL"],

Plugins/SQLiteDriverPlugin/SQLitePlugin.swift

@@ -14,6 +14,10 @@ final class SQLitePlugin: NSObject, TableProPlugin, DriverPlugin {
     static let pluginDescription = "SQLite file-based database support"
     static let capabilities: [PluginCapability] = [.databaseDriver]
 
+    static let explainVariants: [ExplainVariant] = [
+        ExplainVariant(id: "explain", label: "Explain", sqlPrefix: "EXPLAIN QUERY PLAN")
+    ]
+
     static let databaseTypeId = "SQLite"
     static let databaseDisplayName = "SQLite"
     static let iconName = "sqlite-icon"

TablePro/Core/Plugins/PluginMetadataRegistry+RegistryDefaults.swift

@@ -766,7 +766,11 @@ extension PluginMetadataRegistry {
                 displayName: "DuckDB", iconName: "duckdb-icon", defaultPort: 0,
                 requiresAuthentication: false, supportsForeignKeys: true, supportsSchemaEditing: true,
                 isDownloadable: true, primaryUrlScheme: "duckdb", parameterStyle: .dollar,
-                navigationModel: .standard, explainVariants: [], pathFieldRole: .filePath,
+                navigationModel: .standard,
+                explainVariants: [
+                    ExplainVariant(id: "explain", label: "EXPLAIN", sqlPrefix: "EXPLAIN"),
+                ],
+                pathFieldRole: .filePath,
                 supportsHealthMonitor: false, urlSchemes: ["duckdb"], postConnectActions: [],
                 brandColorHex: "#FFD900",
                 queryLanguageName: "SQL", editorLanguage: .sql,