Merge cockroachdb#26067

26067: distsql: blacklist CURRENT_SCHEMA r=RaduBerinde a=RaduBerinde

Blacklist builtins that use `EvalContext.Planner`.

Release note: None

Co-authored-by: Radu Berinde <radu@cockroachlabs.com>

pkg/sql/logictest/testdata/logic_test/builtin_function

@@ -1203,6 +1203,14 @@ SELECT CURRENT_SCHEMAS(false)
 ----
 {"public"}
 
+# Force the function to be evaluated at execution time and verify it doesn't
+# break when distsql is on.
+query T
+SELECT CURRENT_SCHEMAS(x) FROM (VALUES (true), (false)) AS t(x);
+----
+{"pg_catalog","public"}
+{"public"}
+
 statement ok
 SET SEARCH_PATH=test,pg_catalog
 

pkg/sql/sem/builtins/builtins.go

@@ -2305,9 +2305,10 @@ may increase either contention or retry errors, or both.`,
  // SQL client against a pg server.
  "current_schema": {
  tree.Builtin{
- Types: tree.ArgTypes{},
- ReturnType: tree.FixedReturnType(types.String),
- Category: categorySystemInfo,
+ Types: tree.ArgTypes{},
+ ReturnType: tree.FixedReturnType(types.String),
+ Category: categorySystemInfo,
+ DistsqlBlacklist: true,
  Fn: func(evalCtx *tree.EvalContext, args tree.Datums) (tree.Datum, error) {
  ctx := evalCtx.Ctx()
  curDb := evalCtx.SessionData.Database
@@ -2336,9 +2337,10 @@ may increase either contention or retry errors, or both.`,
  // server.
  "current_schemas": {
  tree.Builtin{
- Types: tree.ArgTypes{{"include_pg_catalog", types.Bool}},
- ReturnType: tree.FixedReturnType(types.TArray{Typ: types.String}),
- Category: categorySystemInfo,
+ Types: tree.ArgTypes{{"include_pg_catalog", types.Bool}},
+ ReturnType: tree.FixedReturnType(types.TArray{Typ: types.String}),
+ Category: categorySystemInfo,
+ DistsqlBlacklist: true,
  Fn: func(evalCtx *tree.EvalContext, args tree.Datums) (tree.Datum, error) {
  ctx := evalCtx.Ctx()
  curDb := evalCtx.SessionData.Database