diff --git a/crates/dbx-driver-postgres/src/postgres.rs b/crates/dbx-driver-postgres/src/postgres.rs
index 25a90c526a..4326b466b9 100644
--- a/crates/dbx-driver-postgres/src/postgres.rs
+++ b/crates/dbx-driver-postgres/src/postgres.rs
@@ -8104,7 +8104,7 @@ const POSTGRES_COLUMNS_SQL: &str = "SELECT a.attname AS column_name, \
                LIMIT 1 \
              ) dep ON TRUE \
              LEFT JOIN pg_sequence pseq ON pseq.seqrelid = dep.objid \
-             WHERE a.attrelid = (CASE WHEN coalesce(length($1), 0) = 0 THEN quote_ident($2) ELSE quote_ident($1) || '.' || quote_ident($2) END)::regclass \
+             WHERE a.attrelid = (CASE WHEN coalesce(length($1::text), 0) = 0 THEN quote_ident($2) ELSE quote_ident($1) || '.' || quote_ident($2) END)::regclass \
              AND a.attnum > 0 AND NOT a.attisdropped \
              ORDER BY a.attnum";
 
@@ -8158,7 +8158,7 @@ const POSTGRES_COLUMNS_COMPAT_SQL: &str = "SELECT a.attname AS column_name, \
                ORDER BY sequence_dep.objid \
                LIMIT 1 \
              ) AND serial_seq.relkind = 'S' \
-             WHERE a.attrelid = (CASE WHEN coalesce(length($1), 0) = 0 THEN quote_ident($2) ELSE quote_ident($1) || '.' || quote_ident($2) END)::regclass \
+             WHERE a.attrelid = (CASE WHEN coalesce(length($1::text), 0) = 0 THEN quote_ident($2) ELSE quote_ident($1) || '.' || quote_ident($2) END)::regclass \
              AND a.attnum > 0 AND NOT a.attisdropped \
              ORDER BY a.attnum";
 
@@ -8186,7 +8186,7 @@ const POSTGRES_COLUMNS_INFORMATION_SCHEMA_SQL: &str = "SELECT c.column_name, \
              CAST(c.character_maximum_length AS int) AS character_maximum_length, \
              NULL::text AS enum_values \
              FROM information_schema.columns c \
-             WHERE c.table_schema = (CASE WHEN coalesce(length($1), 0) = 0 THEN current_schema() ELSE $1 END) \
+             WHERE c.table_schema = (CASE WHEN coalesce(length($1::text), 0) = 0 THEN current_schema() ELSE $1 END) \
              AND c.table_name = $2 \
              ORDER BY c.ordinal_position";
 
@@ -9697,7 +9697,7 @@ const POSTGRES_INDEXES_SQL: &str = "SELECT i.relname AS index_name, \
              LEFT JOIN pg_attribute a ON a.attrelid = t.oid AND a.attnum = k.attnum AND k.attnum > 0 \
              LEFT JOIN pg_opclass oc ON oc.oid = k.class_oid \
              LEFT JOIN pg_namespace opcns ON opcns.oid = oc.opcnamespace \
-             WHERE t.oid = (CASE WHEN coalesce(length($1), 0) = 0 THEN quote_ident($2) ELSE quote_ident($1) || '.' || quote_ident($2) END)::regclass \
+             WHERE t.oid = (CASE WHEN coalesce(length($1::text), 0) = 0 THEN quote_ident($2) ELSE quote_ident($1) || '.' || quote_ident($2) END)::regclass \
              AND k.attnum >= 0 \
              GROUP BY i.relname, i.oid, ix.indisunique, ix.indisvalid, ix.indisprimary, ix.indpred, ix.indrelid, am.amname, ix.indnkeyatts, ix.indkey \
              ORDER BY i.relname";
@@ -9758,7 +9758,7 @@ const POSTGRES_INDEXES_COMPAT_SQL: &str = "SELECT i.relname AS index_name, \
              JOIN pg_class i ON i.oid = ix.indexrelid \
              JOIN pg_namespace n ON n.oid = t.relnamespace \
              JOIN pg_am am ON am.oid = i.relam \
-             WHERE t.oid = (CASE WHEN coalesce(length($1), 0) = 0 THEN quote_ident($2) ELSE quote_ident($1) || '.' || quote_ident($2) END)::regclass \
+             WHERE t.oid = (CASE WHEN coalesce(length($1::text), 0) = 0 THEN quote_ident($2) ELSE quote_ident($1) || '.' || quote_ident($2) END)::regclass \
              ORDER BY i.relname";
 
 const POSTGRES_OWNERS_SQL: &str =
@@ -14400,18 +14400,18 @@ mod tests {
     #[test]
     fn postgres_single_relation_metadata_can_resolve_through_search_path() {
         // GaussDB A mode folds `''` to NULL, so `$1 = ''` is never true there and the
-        // unqualified branch was skipped (issue #12198). `coalesce(length($1), 0) = 0`
+        // unqualified branch was skipped (issue #12198). `coalesce(length($1::text), 0) = 0`
         // matches both NULL and the empty string on every PostgreSQL-compatible kernel.
         for sql in [POSTGRES_COLUMNS_SQL, POSTGRES_COLUMNS_COMPAT_SQL] {
-            assert!(sql.contains("CASE WHEN coalesce(length($1), 0) = 0 THEN quote_ident($2)"), "{sql}");
+            assert!(sql.contains("CASE WHEN coalesce(length($1::text), 0) = 0 THEN quote_ident($2)"), "{sql}");
             assert!(!sql.contains("information_schema.columns"));
         }
         for sql in [POSTGRES_INDEXES_SQL, POSTGRES_INDEXES_COMPAT_SQL] {
-            assert!(sql.contains("t.oid = (CASE WHEN coalesce(length($1), 0) = 0 THEN quote_ident($2)"), "{sql}");
+            assert!(sql.contains("t.oid = (CASE WHEN coalesce(length($1::text), 0) = 0 THEN quote_ident($2)"), "{sql}");
         }
         assert!(
             POSTGRES_COLUMNS_INFORMATION_SCHEMA_SQL
-                .contains("CASE WHEN coalesce(length($1), 0) = 0 THEN current_schema() ELSE $1 END"),
+                .contains("CASE WHEN coalesce(length($1::text), 0) = 0 THEN current_schema() ELSE $1 END"),
             "{POSTGRES_COLUMNS_INFORMATION_SCHEMA_SQL}"
         );
     }