diff --git a/core/src/main/java/org/apache/calcite/sql/type/SqlTypeUtil.java b/core/src/main/java/org/apache/calcite/sql/type/SqlTypeUtil.java
index 2468a983292a..f8ccdb92e20a 100644
--- a/core/src/main/java/org/apache/calcite/sql/type/SqlTypeUtil.java
+++ b/core/src/main/java/org/apache/calcite/sql/type/SqlTypeUtil.java
@@ -686,6 +686,82 @@ public static long getMaxValue(RelDataType type) {
     }
   }
 
+  /** Returns whether a type has a representation as a Java primitive (ignoring
+   * nullability). */
+  @Deprecated // to be removed before 2.0
+  public static boolean isJavaPrimitive(RelDataType type) {
+    SqlTypeName typeName = type.getSqlTypeName();
+    if (typeName == null) {
+      return false;
+    }
+
+    switch (typeName) {
+    case BOOLEAN:
+    case TINYINT:
+    case SMALLINT:
+    case INTEGER:
+    case BIGINT:
+    case FLOAT:
+    case REAL:
+    case DOUBLE:
+    case SYMBOL:
+      return true;
+    default:
+      return false;
+    }
+  }
+
+  /** Returns the class name of the wrapper for the primitive data type. */
+  @Deprecated // to be removed before 2.0
+  public static @Nullable String getPrimitiveWrapperJavaClassName(@Nullable RelDataType type) {
+    if (type == null) {
+      return null;
+    }
+    SqlTypeName typeName = type.getSqlTypeName();
+    if (typeName == null) {
+      return null;
+    }
+
+    switch (typeName) {
+    case BOOLEAN:
+      return "Boolean";
+    default:
+      //noinspection deprecation
+      return getNumericJavaClassName(type);
+    }
+  }
+
+  /** Returns the class name of a numeric data type. */
+  @Deprecated // to be removed before 2.0
+  public static @Nullable String getNumericJavaClassName(@Nullable RelDataType type) {
+    if (type == null) {
+      return null;
+    }
+    SqlTypeName typeName = type.getSqlTypeName();
+    if (typeName == null) {
+      return null;
+    }
+
+    switch (typeName) {
+    case TINYINT:
+      return "Byte";
+    case SMALLINT:
+      return "Short";
+    case INTEGER:
+      return "Integer";
+    case BIGINT:
+      return "Long";
+    case REAL:
+      return "Float";
+    case DECIMAL:
+    case FLOAT:
+    case DOUBLE:
+      return "Double";
+    default:
+      return null;
+    }
+  }
+
   private static boolean isAny(RelDataType t) {
     return t.getFamily() == SqlTypeFamily.ANY;
   }