sqlite_lint: add support for FTS5 and virtual tables

pkg/schema/lint/checks.go

@@ -23,7 +23,10 @@ var Checks = []Check{
 		Explanation: "All columns should be marked as `not null` unless they are foreign keys.  (Primary keys are\n" +
 			"automatically not-null, and don't need to be specified.)",
 		Execute: func(s schema.Schema) (ret []CheckResult) {
-			for tablename := range s.Tables {
+			for tablename, tbl := range s.Tables {
+				if tbl.TableType != "table" {
+					continue
+				}
 				for _, column := range s.Tables[tablename].Columns {
 					if !column.IsNotNull && !column.IsForeignKey && !column.IsPrimaryKey {
 						ret = append(ret, CheckResult{
@@ -43,7 +46,10 @@ var Checks = []Check{
 			"integer, real, text, blob or any).  This disallows all 'date' and 'time' column types.\n" +
 			"See more: https://www.sqlite.org/stricttables.html",
 		Execute: func(s schema.Schema) (ret []CheckResult) {
-			for tablename := range s.Tables {
+			for tablename, tbl := range s.Tables {
+				if tbl.TableType != "table" {
+					continue
+				}
 				if !s.Tables[tablename].IsStrict {
 					ret = append(ret, CheckResult{
 						ErrorMsg:   "Table should be marked \"strict\"",
@@ -78,7 +84,10 @@ var Checks = []Check{
 		Explanation: "All tables must have a primary key.  If it's rowid, it has to be named explicitly.",
 		Execute: func(s schema.Schema) (ret []CheckResult) {
 		tableloop:
-			for tablename := range s.Tables {
+			for tablename, tbl := range s.Tables {
+				if tbl.TableType != "table" {
+					continue
+				}
 				for _, column := range s.Tables[tablename].Columns {
 					if column.IsPrimaryKey {
 						continue tableloop
@@ -161,6 +170,9 @@ var Checks = []Check{
 		Execute: func(s schema.Schema) (ret []CheckResult) {
 		tbl_loop:
 			for tblName, tbl := range s.Tables {
+				if tbl.TableType != "table" {
+					continue
+				}
 				if tbl.IsWithoutRowid {
 					continue
 				}