diff --git a/sql/connect/common/src/test/resources/query-tests/explain-results/expression_extension_deprecated.explain b/sql/connect/common/src/test/resources/query-tests/explain-results/expression_extension_deprecated.explain
deleted file mode 100644
index 7426332004a8..000000000000
--- a/sql/connect/common/src/test/resources/query-tests/explain-results/expression_extension_deprecated.explain
+++ /dev/null
@@ -1,2 +0,0 @@
-Project [id#0L AS abc#0L]
-+- LocalRelation <empty>, [id#0L, a#0, b#0]
diff --git a/sql/connect/common/src/test/resources/query-tests/explain-results/function_substring_with_columns.explain b/sql/connect/common/src/test/resources/query-tests/explain-results/function_substring_with_columns.explain
deleted file mode 100644
index fe07244fc9ce..000000000000
--- a/sql/connect/common/src/test/resources/query-tests/explain-results/function_substring_with_columns.explain
+++ /dev/null
@@ -1,2 +0,0 @@
-Project [substring(g#0, 4, 5) AS substring(g, 4, 5)#0]
-+- LocalRelation <empty>, [id#0L, a#0, b#0, d#0, e#0, f#0, g#0]
diff --git a/sql/connect/common/src/test/resources/query-tests/explain-results/relation_extension_deprecated.explain b/sql/connect/common/src/test/resources/query-tests/explain-results/relation_extension_deprecated.explain
deleted file mode 100644
index df724a7dd185..000000000000
--- a/sql/connect/common/src/test/resources/query-tests/explain-results/relation_extension_deprecated.explain
+++ /dev/null
@@ -1 +0,0 @@
-LocalRelation <empty>, [id#0L, a#0, b#0]
diff --git a/sql/connect/common/src/test/resources/query-tests/queries/expression_extension_deprecated.json b/sql/connect/common/src/test/resources/query-tests/queries/expression_extension_deprecated.json
deleted file mode 100644
index acfb3cc2333d..000000000000
--- a/sql/connect/common/src/test/resources/query-tests/queries/expression_extension_deprecated.json
+++ /dev/null
@@ -1,26 +0,0 @@
-{
-  "common": {
-    "planId": "1"
-  },
-  "project": {
-    "input": {
-      "common": {
-        "planId": "0"
-      },
-      "localRelation": {
-        "schema": "struct\u003cid:bigint,a:int,b:double\u003e"
-      }
-    },
-    "expressions": [{
-      "extension": {
-        "@type": "type.googleapis.com/spark.connect.ExamplePluginExpression",
-        "child": {
-          "unresolvedAttribute": {
-            "unparsedIdentifier": "id"
-          }
-        },
-        "customField": "abc"
-      }
-    }]
-  }
-}
\ No newline at end of file
diff --git a/sql/connect/common/src/test/resources/query-tests/queries/expression_extension_deprecated.proto.bin b/sql/connect/common/src/test/resources/query-tests/queries/expression_extension_deprecated.proto.bin
deleted file mode 100644
index 24669eba6423..000000000000
Binary files a/sql/connect/common/src/test/resources/query-tests/queries/expression_extension_deprecated.proto.bin and /dev/null differ
diff --git a/sql/connect/common/src/test/resources/query-tests/queries/relation_extension_deprecated.json b/sql/connect/common/src/test/resources/query-tests/queries/relation_extension_deprecated.json
deleted file mode 100644
index 47ceba13ca7e..000000000000
--- a/sql/connect/common/src/test/resources/query-tests/queries/relation_extension_deprecated.json
+++ /dev/null
@@ -1,16 +0,0 @@
-{
-  "common": {
-    "planId": "1"
-  },
-  "extension": {
-    "@type": "type.googleapis.com/spark.connect.ExamplePluginRelation",
-    "input": {
-      "common": {
-        "planId": "0"
-      },
-      "localRelation": {
-        "schema": "struct\u003cid:bigint,a:int,b:double\u003e"
-      }
-    }
-  }
-}
\ No newline at end of file
diff --git a/sql/connect/common/src/test/resources/query-tests/queries/relation_extension_deprecated.proto.bin b/sql/connect/common/src/test/resources/query-tests/queries/relation_extension_deprecated.proto.bin
deleted file mode 100644
index 680bb550eca5..000000000000
Binary files a/sql/connect/common/src/test/resources/query-tests/queries/relation_extension_deprecated.proto.bin and /dev/null differ