diff --git a/crates/datafusion_ext/src/planner/mod.rs b/crates/datafusion_ext/src/planner/mod.rs
index e8d67d58c..beac657db 100644
--- a/crates/datafusion_ext/src/planner/mod.rs
+++ b/crates/datafusion_ext/src/planner/mod.rs
@@ -269,6 +269,16 @@ impl<'a, S: AsyncContextProvider> SqlQueryPlanner<'a, S> {
             }
             SQLDataType::Bytea => Ok(DataType::Binary),
             SQLDataType::Interval => Ok(DataType::Interval(IntervalUnit::MonthDayNano)),
+            SQLDataType::Custom(obj, _) => {
+                let obj = obj.to_string();
+                match obj.as_str() {
+                    // PSQL uses `pg_catalog.text` for `text` type in some cases
+                    "pg_catalog.text" => Ok(DataType::Utf8),
+                    _ => Err(DataFusionError::NotImplemented(format!(
+                        "Unsupported SQL type {sql_type:?}"
+                    ))),
+                }
+            }
             // Explicitly list all other types so that if sqlparser
             // adds/changes the `SQLDataType` the compiler will tell us on upgrade
             // and avoid bugs like https://github.com/apache/arrow-datafusion/issues/3059
@@ -280,7 +290,6 @@ impl<'a, S: AsyncContextProvider> SqlQueryPlanner<'a, S> {
             | SQLDataType::Blob(_)
             | SQLDataType::Datetime(_)
             | SQLDataType::Regclass
-            | SQLDataType::Custom(_, _)
             | SQLDataType::Array(_)
             | SQLDataType::Enum(_)
             | SQLDataType::Set(_)
diff --git a/testdata/sqllogictests/pg_catalog.slt b/testdata/sqllogictests/pg_catalog.slt
index c0593542e..f05664cfe 100644
--- a/testdata/sqllogictests/pg_catalog.slt
+++ b/testdata/sqllogictests/pg_catalog.slt
@@ -83,4 +83,37 @@ pg_catalog_test  pg_description
 
 
 statement ok
-select * from pg_catalog.pg_type;
\ No newline at end of file
+select * from pg_catalog.pg_type;
+
+
+# This is one of the queries postgres uses for tab completion
+# see https://github.com/GlareDB/glaredb/issues/2393
+statement ok 
+SELECT 
+  c.relname, 
+  NULL::pg_catalog.text 
+FROM pg_catalog.pg_class c 
+WHERE c.relkind IN ('r', 'S', 'v', 'm', 'f', 'p') 
+AND (c.relname) LIKE '%' 
+AND pg_catalog.pg_table_is_visible(c.oid) 
+AND c.relnamespace <> ( SELECT oid FROM pg_catalog.pg_namespace WHERE nspname = 'pg_catalog') UNION ALL 
+SELECT NULL::pg_catalog.text, n.nspname 
+FROM pg_catalog.pg_namespace n 
+WHERE n.nspname LIKE '%' 
+AND n.nspname NOT LIKE E'pg\\_%' 
+LIMIT 1000;
+
+# Another query postgres uses for tab completion
+# see https://github.com/GlareDB/glaredb/issues/2393
+statement ok
+SELECT 
+  c.relname, 
+  n.nspname 
+FROM 
+  pg_catalog.pg_class c, 
+  pg_catalog.pg_namespace n 
+WHERE c.relnamespace = n.oid 
+AND c.relkind IN ('r', 'S', 'v', 'm', 'f', 'p') 
+AND (c.relname) LIKE '%' 
+AND n.nspname = 'pg_catalog' 
+LIMIT 1000;