feat(catalog): add pg_my_temp_schema and pg_get_viewdef(int4, bool… (#…

…19750)

e2e_test/batch/catalog/sysinfo.slt.part

@@ -70,6 +70,16 @@ select pg_get_viewdef('tab_mv'::regclass);
 ----
 SELECT a.c AS ac, b.c AS bc FROM tab AS a JOIN tab AS b ON a.a = b.b
 
+query T
+select pg_get_viewdef('tab_mv'::regclass, false);
+----
+SELECT a.c AS ac, b.c AS bc FROM tab AS a JOIN tab AS b ON a.a = b.b
+
+query T
+select pg_get_viewdef('tab_mv'::regclass, true);
+----
+SELECT a.c AS ac, b.c AS bc FROM tab AS a JOIN tab AS b ON a.a = b.b
+
 query error Invalid parameter oid: view or materialized view does not exist:
 select pg_get_viewdef('tab'::regclass);
 

src/frontend/src/binder/expr/function/builtin_scalar.rs

@@ -533,6 +533,13 @@ impl Binder {
                         .into())
                     }
                 })),
+                ("pg_my_temp_schema", guard_by_len(0, raw(|_binder, _inputs| {
+                    // Returns the OID of the current session's temporary schema, or zero if it has none (because it has not created any temporary tables).
+                    Ok(ExprImpl::literal_int(
+                        // always return 0, as we haven't supported temporary tables nor temporary schema yet
+                        0,
+                    ))
+                }))),
                 ("current_setting", guard_by_len(1, raw(|binder, inputs| {
                     let input = &inputs[0];
                     let input = if let ExprImpl::Literal(literal) = input &&

src/frontend/src/catalog/system_catalog/pg_catalog/pg_proc.rs

@@ -31,4 +31,5 @@ struct PgProc {
     // Data type of the return value, refer to pg_type.
     prorettype: i32,
     prokind: String,
+    proargtypes: Vec<i32>,
 }

src/frontend/src/expr/function_impl/pg_get_viewdef.rs

@@ -24,6 +24,11 @@ use crate::catalog::CatalogReader;
 
 #[function("pg_get_viewdef(int4) -> varchar")]
 fn pg_get_viewdef(oid: i32, writer: &mut impl Write) -> Result<()> {
+    pg_get_viewdef_pretty(oid, false, writer)
+}
+
+#[function("pg_get_viewdef(int4, boolean) -> varchar")]
+fn pg_get_viewdef_pretty(oid: i32, _pretty: bool, writer: &mut impl Write) -> Result<()> {
     pg_get_viewdef_impl_captured(oid, writer)
 }