tjbanghart commented on code in PR #3034:
URL: https://github.com/apache/calcite/pull/3034#discussion_r1083554622


##########
core/src/main/java/org/apache/calcite/util/format/FormatModelUtil.java:
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@@ -0,0 +1,74 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to you under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.calcite.util.format;
+
+import com.google.common.collect.ImmutableMap;
+
+import java.util.List;
+import java.util.Stack;
+
+/**
+ * Utility class used to convert format strings into {@link 
FormatModelElement}s.
+ */
+public class FormatModelUtil {
+
+  private FormatModelUtil() {}
+
+  /**
+   * Parses the {@code fmtString} using element identifiers supplied by {@code 
fmtModel}.
+   *
+   * TODO(CALCITE-2980): make this configurable for multiple parse maps. 
Currently this only works
+   * for BigQuery and MySQL style format strings where elements begin with '%'
+   */
+  public static List<FormatModelElement> parse(String fmtString,

Review Comment:
   Took a stab at this in most recent commit.



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