Resolve table name with schema (#768)

mieciu · web-flow · commit 50792b18f0d5 · 2024-09-16T12:46:50.000Z
diff --git a/quesma/clickhouse/clickhouse.go b/quesma/clickhouse/clickhouse.go
@@ -115,6 +115,7 @@ func (lm *LogManager) Stop() {
 
 type discoveredTable struct {
 	name               string
+	databaseName       string
 	columnTypes        map[string]string
 	config             config.IndexConfiguration
 	comment            string
diff --git a/quesma/clickhouse/quesma_communicator.go b/quesma/clickhouse/quesma_communicator.go
@@ -160,7 +160,10 @@ func executeQuery(ctx context.Context, lm *LogManager, query *model.Query, field
 	//
 
 	settings := make(clickhouse.Settings)
-	settings["readonly"] = "1"
+	// this "readonly" setting turned out to be causing problems with Hydrolix queries
+	// the queries looked pretty legit, but the key difference was the use of schema (`FROM "schema"."tableName"`)
+	// to be revisited in the future
+	// settings["readonly"] = "1"
 	settings["allow_ddl"] = "0"
 
 	if query.OptimizeHints != nil {
@@ -185,7 +188,6 @@ func executeQuery(ctx context.Context, lm *LogManager, query *model.Query, field
 		performanceResult.Error = err
 		return nil, performanceResult, end_user_errors.GuessClickhouseErrorType(err).InternalDetails("clickhouse: query failed. err: %v, query: %v", err, queryAsString)
 	}
-
 	res, err = read(rows, fields, rowToScan)
 
 	elapsed := span.End(nil)
diff --git a/quesma/clickhouse/table_discovery.go b/quesma/clickhouse/table_discovery.go
@@ -78,6 +78,7 @@ func (t TableDiscoveryTableProviderAdapter) TableDefinitions() map[string]schema
 				Type: column.Type.String(),
 			}
 		}
+		table.DatabaseName = value.DatabaseName
 		tables[tableName] = table
 		return true
 	})
@@ -162,7 +163,7 @@ func (td *tableDiscovery) configureTables(tables map[string]map[string]string, d
 				comment := td.tableComment(databaseName, table)
 				createTableQuery := td.createTableQuery(databaseName, table)
 				// we assume here that @timestamp field is always present in the table, or it's explicitly configured
-				configuredTables[table] = discoveredTable{table, columns, indexConfig, comment, createTableQuery, ""}
+				configuredTables[table] = discoveredTable{table, databaseName, columns, indexConfig, comment, createTableQuery, ""}
 			}
 		} else {
 			notConfiguredTables = append(notConfiguredTables, table)
@@ -191,7 +192,7 @@ func (td *tableDiscovery) autoConfigureTables(tables map[string]map[string]strin
 		} else {
 			maybeTimestampField = td.tableTimestampField(databaseName, table, ClickHouse)
 		}
-		configuredTables[table] = discoveredTable{table, columns, config.IndexConfiguration{}, comment, createTableQuery, maybeTimestampField}
+		configuredTables[table] = discoveredTable{table, databaseName, columns, config.IndexConfiguration{}, comment, createTableQuery, maybeTimestampField}
 
 	}
 	for tableName, table := range configuredTables {
diff --git a/quesma/model/expr.go b/quesma/model/expr.go
@@ -127,7 +127,10 @@ func (s DistinctExpr) Accept(v ExprVisitor) interface{} {
 type TableRef struct {
 	Name string
 	// to be considered - alias (e.g. FROM tableName AS t)
-	// to be considered - database prefix (e.g. FROM databaseName.tableName)
+
+	// DatabaseName is optional and represents what in database realm is called 'schema', e.g. 'FROM databaseName.tableName'
+	// ClickHouse calls this 'database' so we stick to that; FWIW - Hydrolix calls this a 'project'.
+	DatabaseName string
 }
 
 func NewTableRef(name string) TableRef {
@@ -138,6 +141,10 @@ func (t TableRef) Accept(v ExprVisitor) interface{} {
 	return v.VisitTableRef(t)
 }
 
+func NewTableRefWithDatabaseName(name, databaseName string) TableRef {
+	return TableRef{Name: name, DatabaseName: databaseName}
+}
+
 type OrderByDirection int8
 
 const (
diff --git a/quesma/model/expr_string_renderer.go b/quesma/model/expr_string_renderer.go
@@ -107,12 +107,22 @@ func (v *renderer) VisitDistinctExpr(e DistinctExpr) interface{} {
 }
 
 func (v *renderer) VisitTableRef(e TableRef) interface{} {
+	var result []string
 
+	if e.DatabaseName != "" {
+		if identifierRegexp.MatchString(e.DatabaseName) {
+			result = append(result, e.DatabaseName)
+		} else {
+			result = append(result, strconv.Quote(e.DatabaseName))
+		}
+	}
 	if identifierRegexp.MatchString(e.Name) {
-		return e.Name
+		result = append(result, e.Name)
+	} else {
+		result = append(result, strconv.Quote(e.Name))
 	}
 
-	return strconv.Quote(e.Name)
+	return strings.Join(result, ".")
 }
 
 func (v *renderer) VisitAliasedExpr(e AliasedExpr) interface{} {
diff --git a/quesma/quesma/mappings_test.go b/quesma/quesma/mappings_test.go
@@ -104,7 +104,7 @@ func newSchemaFromColumns(fields map[string]schema.Column) schema.Schema {
 			Type:                 parsedType,
 		}
 	}
-	return schema.NewSchema(schemaFields, true)
+	return schema.NewSchema(schemaFields, true, "")
 }
 
 func TestParseMappings_KibanaSampleFlights(t *testing.T) {
diff --git a/quesma/quesma/schema_transformer.go b/quesma/quesma/schema_transformer.go
@@ -347,7 +347,7 @@ func (s *SchemaCheckPass) applyPhysicalFromExpression(currentSchema schema.Schem
 	}
 
 	// TODO compute physical from expression based on single table or union or whatever ....
-	physicalFromExpression := model.NewTableRef(query.TableName)
+	physicalFromExpression := model.NewTableRefWithDatabaseName(query.TableName, currentSchema.DatabaseName)
 
 	visitor := model.NewBaseVisitor()
 
@@ -362,6 +362,7 @@ func (s *SchemaCheckPass) applyPhysicalFromExpression(currentSchema schema.Schem
 	if _, ok := expr.(*model.SelectCommand); ok {
 		query.SelectCommand = *expr.(*model.SelectCommand)
 	}
+
 	return query, nil
 }
 
diff --git a/quesma/schema/hierarchical_schema_test.go b/quesma/schema/hierarchical_schema_test.go
@@ -15,7 +15,7 @@ func Test_SchemaToHierarchicalSchema(t *testing.T) {
 		"product.product_id":     {PropertyName: "product.product_id", InternalPropertyName: "product::product_id", Type: QuesmaTypeInteger},
 		"triple.nested.example1": {PropertyName: "triple.nested.example1", InternalPropertyName: "triple::nested::example1", Type: QuesmaTypeText},
 		"triple.nested.example2": {PropertyName: "triple.nested.example2", InternalPropertyName: "triple::nested::example2", Type: QuesmaTypeKeyword},
-	}, map[FieldName]FieldName{}, true)
+	}, map[FieldName]FieldName{}, true, "")
 
 	hs := SchemaToHierarchicalSchema(&s)
 	assert.Equal(t, "", hs.Name)
diff --git a/quesma/schema/registry.go b/quesma/schema/registry.go
@@ -29,7 +29,8 @@ type (
 		AutodiscoveryEnabled() bool
 	}
 	Table struct {
-		Columns map[string]Column
+		Columns      map[string]Column
+		DatabaseName string
 	}
 	Column struct {
 		Name string
@@ -41,10 +42,10 @@ func (s *schemaRegistry) loadSchemas() (map[TableName]Schema, error) {
 	definitions := s.dataSourceTableProvider.TableDefinitions()
 	schemas := make(map[TableName]Schema)
 	if s.dataSourceTableProvider.AutodiscoveryEnabled() {
-		for tableName := range definitions {
+		for tableName, table := range definitions {
 			fields := make(map[FieldName]Field)
 			existsInDataSource := s.populateSchemaFromTableDefinition(definitions, tableName, fields)
-			schemas[TableName(tableName)] = NewSchema(fields, existsInDataSource)
+			schemas[TableName(tableName)] = NewSchema(fields, existsInDataSource, table.DatabaseName)
 		}
 		return schemas, nil
 	}
@@ -59,7 +60,11 @@ func (s *schemaRegistry) loadSchemas() (map[TableName]Schema, error) {
 		s.populateAliases(indexConfiguration, fields, aliases)
 		s.removeIgnoredFields(indexConfiguration, fields, aliases)
 		s.removeGeoPhysicalFields(fields)
-		schemas[TableName(indexName)] = NewSchemaWithAliases(fields, aliases, existsInDataSource)
+		if tableDefinition, ok := definitions[indexName]; ok {
+			schemas[TableName(indexName)] = NewSchemaWithAliases(fields, aliases, existsInDataSource, tableDefinition.DatabaseName)
+		} else {
+			schemas[TableName(indexName)] = NewSchemaWithAliases(fields, aliases, existsInDataSource, "")
+		}
 	}
 
 	return schemas, nil
diff --git a/quesma/schema/registry_test.go b/quesma/schema/registry_test.go
@@ -48,7 +48,7 @@ func Test_schemaRegistry_FindSchema(t *testing.T) {
 				"message":    {PropertyName: "message", InternalPropertyName: "message", Type: schema.QuesmaTypeKeyword, InternalPropertyType: "String"},
 				"event_date": {PropertyName: "event_date", InternalPropertyName: "event_date", Type: schema.QuesmaTypeTimestamp, InternalPropertyType: "DateTime64"},
 				"count":      {PropertyName: "count", InternalPropertyName: "count", Type: schema.QuesmaTypeLong, InternalPropertyType: "Int64"}},
-				true),
+				true, ""),
 			found: true,
 		},
 		{
@@ -77,7 +77,7 @@ func Test_schemaRegistry_FindSchema(t *testing.T) {
 				"event_date": {PropertyName: "event_date", InternalPropertyName: "event_date", Type: schema.QuesmaTypeTimestamp, InternalPropertyType: "DateTime64"},
 				"count":      {PropertyName: "count", InternalPropertyName: "count", Type: schema.QuesmaTypeLong, InternalPropertyType: "Int64"}},
 
-				true),
+				true, ""),
 			found: true,
 		},
 		{
@@ -104,7 +104,7 @@ func Test_schemaRegistry_FindSchema(t *testing.T) {
 				"message":    {PropertyName: "message", InternalPropertyName: "message", Type: schema.QuesmaTypeKeyword, InternalPropertyType: ""},
 				"event_date": {PropertyName: "event_date", InternalPropertyName: "event_date", Type: schema.QuesmaTypeTimestamp, InternalPropertyType: "DateTime64"},
 				"count":      {PropertyName: "count", InternalPropertyName: "count", Type: schema.QuesmaTypeLong, InternalPropertyType: "Int64"}},
-				true),
+				true, ""),
 			found: true,
 		},
 		{
@@ -129,7 +129,7 @@ func Test_schemaRegistry_FindSchema(t *testing.T) {
 				"message":    {PropertyName: "message", InternalPropertyName: "message", Type: schema.QuesmaTypeKeyword},
 				"event_date": {PropertyName: "event_date", InternalPropertyName: "event_date", Type: schema.QuesmaTypeTimestamp, InternalPropertyType: "DateTime64"},
 				"count":      {PropertyName: "count", InternalPropertyName: "count", Type: schema.QuesmaTypeLong, InternalPropertyType: "Int64"}},
-				true),
+				true, ""),
 			found: true,
 		},
 		{
@@ -145,7 +145,7 @@ func Test_schemaRegistry_FindSchema(t *testing.T) {
 			},
 			tableDiscovery: fixedTableProvider{tables: map[string]schema.Table{}},
 			tableName:      "some_table",
-			want:           schema.NewSchema(map[schema.FieldName]schema.Field{"message": {PropertyName: "message", InternalPropertyName: "message", Type: schema.QuesmaTypeKeyword}}, false),
+			want:           schema.NewSchema(map[schema.FieldName]schema.Field{"message": {PropertyName: "message", InternalPropertyName: "message", Type: schema.QuesmaTypeKeyword}}, false, ""),
 			found:          true,
 		},
 		{
@@ -171,7 +171,7 @@ func Test_schemaRegistry_FindSchema(t *testing.T) {
 				"message":    {PropertyName: "message", InternalPropertyName: "message", Type: schema.QuesmaTypeKeyword},
 				"event_date": {PropertyName: "event_date", InternalPropertyName: "event_date", Type: schema.QuesmaTypeTimestamp, InternalPropertyType: "DateTime64"},
 				"count":      {PropertyName: "count", InternalPropertyName: "count", Type: schema.QuesmaTypeLong, InternalPropertyType: "Int64"}},
-				true),
+				true, ""),
 			found: true,
 		},
 		{
@@ -199,7 +199,7 @@ func Test_schemaRegistry_FindSchema(t *testing.T) {
 				"event_date": {PropertyName: "event_date", InternalPropertyName: "event_date", Type: schema.QuesmaTypeTimestamp, InternalPropertyType: "DateTime64"},
 				"count":      {PropertyName: "count", InternalPropertyName: "count", Type: schema.QuesmaTypeLong, InternalPropertyType: "Int64"}}, map[schema.FieldName]schema.FieldName{
 				"message_alias": "message",
-			}, true),
+			}, true, ""),
 			found: true,
 		},
 		{
@@ -229,7 +229,7 @@ func Test_schemaRegistry_FindSchema(t *testing.T) {
 				"event_date": {PropertyName: "event_date", InternalPropertyName: "event_date", Type: schema.QuesmaTypeTimestamp, InternalPropertyType: "DateTime64"},
 				"count":      {PropertyName: "count", InternalPropertyName: "count", Type: schema.QuesmaTypeLong, InternalPropertyType: "Int64"}}, map[schema.FieldName]schema.FieldName{
 				"message_alias": "message",
-			}, true),
+			}, true, ""),
 			found: true,
 		},
 		{
@@ -299,7 +299,7 @@ func Test_schemaRegistry_UpdateDynamicConfiguration(t *testing.T) {
 		"message":    {PropertyName: "message", InternalPropertyName: "message", Type: schema.QuesmaTypeKeyword, InternalPropertyType: "String"},
 		"event_date": {PropertyName: "event_date", InternalPropertyName: "event_date", Type: schema.QuesmaTypeTimestamp, InternalPropertyType: "DateTime64"},
 		"count":      {PropertyName: "count", InternalPropertyName: "count", Type: schema.QuesmaTypeLong, InternalPropertyType: "Int64"}},
-		true)
+		true, "")
 	resultSchema, resultFound := s.FindSchema(schema.TableName(tableName))
 	assert.True(t, resultFound, "schema not found")
 	if !reflect.DeepEqual(resultSchema, expectedSchema) {
@@ -320,7 +320,7 @@ func Test_schemaRegistry_UpdateDynamicConfiguration(t *testing.T) {
 		"event_date": {PropertyName: "event_date", InternalPropertyName: "event_date", Type: schema.QuesmaTypeTimestamp, InternalPropertyType: "DateTime64"},
 		"count":      {PropertyName: "count", InternalPropertyName: "count", Type: schema.QuesmaTypeLong, InternalPropertyType: "Int64"},
 		"new_column": {PropertyName: "new_column", InternalPropertyName: "new_column", Type: schema.QuesmaTypeText}},
-		true)
+		true, "")
 	resultSchema, resultFound = s.FindSchema(schema.TableName(tableName))
 	assert.True(t, resultFound, "schema not found")
 	if !reflect.DeepEqual(resultSchema, expectedSchema) {
diff --git a/quesma/schema/schema.go b/quesma/schema/schema.go
@@ -12,6 +12,9 @@ type (
 		Aliases             map[FieldName]FieldName
 		ExistsInDataSource  bool
 		internalNameToField map[FieldName]Field
+		// DatabaseName is the name of the database/schema in the data source,
+		// which in query prepends the physical table name e.g. 'FROM databaseName.tableName'
+		DatabaseName string
 	}
 	Field struct {
 		// PropertyName is how users refer to the field
@@ -25,7 +28,7 @@ type (
 	FieldName string
 )
 
-func NewSchemaWithAliases(fields map[FieldName]Field, aliases map[FieldName]FieldName, existsInDataSource bool) Schema {
+func NewSchemaWithAliases(fields map[FieldName]Field, aliases map[FieldName]FieldName, existsInDataSource bool, databaseName string) Schema {
 	internalNameToField := make(map[FieldName]Field)
 	for _, field := range fields {
 		internalNameToField[field.InternalPropertyName] = field
@@ -35,11 +38,12 @@ func NewSchemaWithAliases(fields map[FieldName]Field, aliases map[FieldName]Fiel
 		Aliases:             aliases,
 		ExistsInDataSource:  existsInDataSource,
 		internalNameToField: internalNameToField,
+		DatabaseName:        databaseName,
 	}
 }
 
-func NewSchema(fields map[FieldName]Field, existsInDataSource bool) Schema {
-	return NewSchemaWithAliases(fields, map[FieldName]FieldName{}, existsInDataSource)
+func NewSchema(fields map[FieldName]Field, existsInDataSource bool, databaseName string) Schema {
+	return NewSchemaWithAliases(fields, map[FieldName]FieldName{}, existsInDataSource, databaseName)
 }
 
 func (f FieldName) AsString() string {
diff --git a/quesma/schema/schema_test.go b/quesma/schema/schema_test.go
@@ -24,28 +24,28 @@ func TestSchema_ResolveField(t *testing.T) {
 		{
 			name:          "should resolve field",
 			fieldName:     "message",
-			schema:        NewSchema(map[FieldName]Field{"message": {PropertyName: "message", InternalPropertyName: "message", Type: QuesmaTypeText}}, false),
+			schema:        NewSchema(map[FieldName]Field{"message": {PropertyName: "message", InternalPropertyName: "message", Type: QuesmaTypeText}}, false, ""),
 			resolvedField: Field{PropertyName: "message", InternalPropertyName: "message", Type: QuesmaTypeText},
 			exists:        true,
 		},
 		{
 			name:          "should not resolve field",
 			fieldName:     "foo",
-			schema:        NewSchema(map[FieldName]Field{"message": {PropertyName: "message", InternalPropertyName: "message", Type: QuesmaTypeText}}, false),
+			schema:        NewSchema(map[FieldName]Field{"message": {PropertyName: "message", InternalPropertyName: "message", Type: QuesmaTypeText}}, false, ""),
 			resolvedField: Field{},
 			exists:        false,
 		},
 		{
 			name:          "should resolve aliased field",
 			fieldName:     "message_alias",
-			schema:        NewSchemaWithAliases(map[FieldName]Field{"message": {PropertyName: "message", InternalPropertyName: "message", Type: QuesmaTypeText}}, map[FieldName]FieldName{"message_alias": "message"}, false),
+			schema:        NewSchemaWithAliases(map[FieldName]Field{"message": {PropertyName: "message", InternalPropertyName: "message", Type: QuesmaTypeText}}, map[FieldName]FieldName{"message_alias": "message"}, false, ""),
 			resolvedField: Field{PropertyName: "message", InternalPropertyName: "message", Type: QuesmaTypeText},
 			exists:        true,
 		},
 		{
 			name:          "should not resolve aliased field",
 			fieldName:     "message_alias",
-			schema:        NewSchemaWithAliases(map[FieldName]Field{"message": {PropertyName: "message", InternalPropertyName: "message", Type: QuesmaTypeText}}, map[FieldName]FieldName{"message_alias": "foo"}, false),
+			schema:        NewSchemaWithAliases(map[FieldName]Field{"message": {PropertyName: "message", InternalPropertyName: "message", Type: QuesmaTypeText}}, map[FieldName]FieldName{"message_alias": "foo"}, false, ""),
 			resolvedField: Field{},
 			exists:        false,
 		},
@@ -73,29 +73,29 @@ func TestSchema_ResolveFieldByInternalName(t *testing.T) {
 	}{
 		{
 			testName:  "empty schema",
-			schema:    NewSchemaWithAliases(map[FieldName]Field{}, map[FieldName]FieldName{}, false),
+			schema:    NewSchemaWithAliases(map[FieldName]Field{}, map[FieldName]FieldName{}, false, ""),
 			fieldName: "message",
 			want:      Field{},
 			found:     false,
 		},
 		{
 			testName:  "schema with fields with internal separators, lookup by property name",
-			schema:    NewSchema(map[FieldName]Field{"foo.bar": {PropertyName: "foo.bar", InternalPropertyName: "foo::bar", Type: QuesmaTypeText}}, false),
+			schema:    NewSchema(map[FieldName]Field{"foo.bar": {PropertyName: "foo.bar", InternalPropertyName: "foo::bar", Type: QuesmaTypeText}}, false, ""),
 			fieldName: "foo.bar",
 			want:      Field{},
 			found:     false,
 		},
 		{
 			testName:  "schema with fields with internal separators, lookup by internal name",
-			schema:    NewSchema(map[FieldName]Field{"foo.bar": {PropertyName: "foo.bar", InternalPropertyName: "foo::bar", Type: QuesmaTypeText}}, false),
+			schema:    NewSchema(map[FieldName]Field{"foo.bar": {PropertyName: "foo.bar", InternalPropertyName: "foo::bar", Type: QuesmaTypeText}}, false, ""),
 			fieldName: "foo::bar",
 			want:      Field{PropertyName: "foo.bar", InternalPropertyName: "foo::bar", Type: QuesmaTypeText},
 			found:     true,
 		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.testName, func(t *testing.T) {
-			s := NewSchemaWithAliases(tt.schema.Fields, tt.schema.Aliases, false)
+			s := NewSchemaWithAliases(tt.schema.Fields, tt.schema.Aliases, false, "")
 			got, found := s.ResolveFieldByInternalName(tt.fieldName)
 			if !reflect.DeepEqual(got, tt.want) {
 				t.Errorf("ResolveFieldByInternalName() got = %v, want %v", got, tt.want)

Original file line number	Diff line number	Diff line change
`@@ -78,6 +78,7 @@ func (t TableDiscoveryTableProviderAdapter) TableDefinitions() map[string]schema`
`78`	`78`	`Type: column.Type.String(),`
`79`	`79`	`}`
`80`	`80`	`}`
	`81`	`+ table.DatabaseName = value.DatabaseName`
`81`	`82`	`tables[tableName] = table`
`82`	`83`	`return true`
`83`	`84`	`})`
`@@ -162,7 +163,7 @@ func (td *tableDiscovery) configureTables(tables map[string]map[string]string, d`
`162`	`163`	`comment := td.tableComment(databaseName, table)`
`163`	`164`	`createTableQuery := td.createTableQuery(databaseName, table)`
`164`	`165`	`// we assume here that @timestamp field is always present in the table, or it's explicitly configured`
`165`		`- configuredTables[table] = discoveredTable{table, columns, indexConfig, comment, createTableQuery, ""}`
	`166`	`+ configuredTables[table] = discoveredTable{table, databaseName, columns, indexConfig, comment, createTableQuery, ""}`
`166`	`167`	`}`
`167`	`168`	`} else {`
`168`	`169`	`notConfiguredTables = append(notConfiguredTables, table)`
`@@ -191,7 +192,7 @@ func (td *tableDiscovery) autoConfigureTables(tables map[string]map[string]strin`
`191`	`192`	`} else {`
`192`	`193`	`maybeTimestampField = td.tableTimestampField(databaseName, table, ClickHouse)`
`193`	`194`	`}`
`194`		`- configuredTables[table] = discoveredTable{table, columns, config.IndexConfiguration{}, comment, createTableQuery, maybeTimestampField}`
	`195`	`+ configuredTables[table] = discoveredTable{table, databaseName, columns, config.IndexConfiguration{}, comment, createTableQuery, maybeTimestampField}`
`195`	`196`
`196`	`197`	`}`
`197`	`198`	`for tableName, table := range configuredTables {`
Original file line number	Diff line number	Diff line change
`@@ -104,7 +104,7 @@ func newSchemaFromColumns(fields map[string]schema.Column) schema.Schema {`
`104`	`104`	`Type: parsedType,`
`105`	`105`	`}`
`106`	`106`	`}`
`107`		`- return schema.NewSchema(schemaFields, true)`
	`107`	`+ return schema.NewSchema(schemaFields, true, "")`
`108`	`108`	`}`
`109`	`109`
`110`	`110`	`func TestParseMappings_KibanaSampleFlights(t *testing.T) {`
Original file line number	Diff line number	Diff line change
`@@ -347,7 +347,7 @@ func (s *SchemaCheckPass) applyPhysicalFromExpression(currentSchema schema.Schem`
`347`	`347`	`}`
`348`	`348`
`349`	`349`	`// TODO compute physical from expression based on single table or union or whatever ....`
`350`		`- physicalFromExpression := model.NewTableRef(query.TableName)`
	`350`	`+ physicalFromExpression := model.NewTableRefWithDatabaseName(query.TableName, currentSchema.DatabaseName)`
`351`	`351`
`352`	`352`	`visitor := model.NewBaseVisitor()`
`353`	`353`
`@@ -362,6 +362,7 @@ func (s *SchemaCheckPass) applyPhysicalFromExpression(currentSchema schema.Schem`
`362`	`362`	`if _, ok := expr.(*model.SelectCommand); ok {`
`363`	`363`	`query.SelectCommand = expr.(model.SelectCommand)`
`364`	`364`	`}`
	`365`	`+`
`365`	`366`	`return query, nil`
`366`	`367`	`}`
`367`	`368`