content: /*
   * 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.sql.fun;
  
  import org.apache.calcite.sql.SqlCallBinding;
  import org.apache.calcite.sql.SqlFunction;
  import org.apache.calcite.sql.SqlFunctionCategory;
  import org.apache.calcite.sql.SqlKind;
  import org.apache.calcite.sql.SqlOperandCountRange;
  import org.apache.calcite.sql.type.OperandTypes;
  import org.apache.calcite.sql.type.ReturnTypes;
  import org.apache.calcite.sql.type.SqlOperandCountRanges;
  import org.apache.calcite.sql.type.SqlTypeFamily;
  import org.apache.calcite.sql.type.SqlTypeTransforms;
  
  import java.util.Locale;
  
  /**
   * The <code>JSON_REMOVE</code> function.
   */
  public class SqlJsonRemoveFunction extends SqlFunction {
  
    public SqlJsonRemoveFunction() {
      super("JSON_REMOVE", SqlKind.OTHER_FUNCTION,
          ReturnTypes.VARCHAR_2000.andThen(SqlTypeTransforms.FORCE_NULLABLE),
          null, null, SqlFunctionCategory.SYSTEM);
    }
  
    @Override public SqlOperandCountRange getOperandCountRange() {
      return SqlOperandCountRanges.from(2);
    }
  
    @Override public boolean checkOperandTypes(SqlCallBinding callBinding,
        boolean throwOnFailure) {
      final int operandCount = callBinding.getOperandCount();
      assert operandCount >= 2;
      if (!OperandTypes.ANY.checkSingleOperandType(
          callBinding, callBinding.operand(0), 0, throwOnFailure)) {
        return false;
      }
      final SqlTypeFamily[] families = new SqlTypeFamily[operandCount];
      families[0] = SqlTypeFamily.ANY;
      for (int i = 1; i < operandCount; i++) {
        families[i] = SqlTypeFamily.CHARACTER;
      }
      return OperandTypes.family(families).checkOperandTypes(callBinding, throwOnFailure);
    }
  
    @Override public String getAllowedSignatures(String opNameToUse) {
      return String.format(Locale.ROOT, "'%s(<%s>, <%s>, <%s>...)'", getName(), SqlTypeFamily.ANY,
          SqlTypeFamily.CHARACTER, SqlTypeFamily.CHARACTER);
    }
  }
  