sql: fix column_default in info_schema so literals are quoted

fixes cockroachdb#96098

In bc3fccd, the format flags were
changed to use FmtPgWireText for
information_schema.columns(column_default). This does not work for
string literals, since that format does not wrap literals in single
quotes.

Now we've changed to FmtParsableNumerics, which does properly add
quotes, and also avoids adding the `:::` type annotation as
FmtPgWireText does.

No release note since this bug was never released.

Release note: None

pkg/sql/information_schema.go

@@ -441,7 +441,7 @@ https://www.postgresql.org/docs/9.5/infoschema-columns.html`,
 				colDefault := tree.DNull
 				if column.HasDefault() {
 					colExpr, err := schemaexpr.FormatExprForDisplay(
-						ctx, table, column.GetDefaultExpr(), &p.semaCtx, p.SessionData(), tree.FmtPgwireText,
+						ctx, table, column.GetDefaultExpr(), &p.semaCtx, p.SessionData(), tree.FmtParsableNumerics,
 					)
 					if err != nil {
 						return err

pkg/sql/logictest/testdata/logic_test/enums

@@ -536,8 +536,8 @@ WHERE
 ORDER BY
   column_name
 ----
-y  hello
-z  hello IS OF (test.public.greeting, test.public.greeting)
+y  'hello'
+z  'hello' IS OF (test.public.greeting, test.public.greeting)
 
 # Test computed columns with enum values.
 statement ok

pkg/sql/logictest/testdata/logic_test/information_schema

@@ -2410,7 +2410,7 @@ WHERE table_schema = 'public' AND table_name = 'with_defaults'
 ----
 table_name     column_name  column_default
 with_defaults  a            9
-with_defaults  b            default
+with_defaults  b            'default'
 with_defaults  c            NULL
 with_defaults  d            NULL
 with_defaults  rowid        unique_rowid()

pkg/sql/logictest/testdata/logic_test/system

@@ -250,10 +250,10 @@ descriptor  BYTES  true   NULL  ·  {primary}  false
 query TTBTTTB
 SHOW COLUMNS FROM system.users
 ----
-username        STRING  false  NULL  ·  {primary,users_user_id_idx}  false
-hashedPassword  BYTES   true   NULL  ·  {primary}                    false
-isRole          BOOL    false  f     ·  {primary}                    false
-user_id         OID     false  NULL  ·  {primary,users_user_id_idx}  false
+username        STRING  false  NULL   ·  {primary,users_user_id_idx}  false
+hashedPassword  BYTES   true   NULL   ·  {primary}                    false
+isRole          BOOL    false  false  ·  {primary}                    false
+user_id         OID     false  NULL   ·  {primary,users_user_id_idx}  false
 
 query TTBTTTB
 SHOW COLUMNS FROM system.zones