const dwqp = function () {

  function parse(sql) {
    try {
      const possible = {}
      const ast = parse_sql(sql)
      //console.log('sql:', sql);
      //console.log("ast", ast.value.selectItems)
      possible.select = get_select_clause(ast)
      possible.from = get_from_clause(ast)
      possible.order = get_order_clause(ast)
      possible.where = get_where_clause(ast)
      possible.group = get_group_clause(ast)
      possible.having = get_having_clause(ast)
      possible.limit = get_limit_clause(ast)
      return possible
    } catch (e) {
      //logger.debug('Could not parse SQL.  This is expected when student gives us a malformed query.  No big deal, we will fall back to doing a text parse')()
      //logger.debug('Error Message', e)()
      return null
    }
  }

  function parse_sql(sql) {
    //const parser = require('js-sql-parser');
    try {
      return sqlParser.parse(sql)
    } catch (e) {
      // there was an error parsing the query, try again by replacing DW full outer join syntax with MySql cross join
      const regex = /full[\s]+(outer[\s]+)?join/gi;
      let new_sql = sql.replace(regex, "cross join")
      return sqlParser.parse(new_sql)
    }
  }


  function get_select_clause(ast) {
    const clause = {}

    function recurse(cur, prop) {// copied from flatten
      if (cur) {
        if (cur.type) {
          if (cur.value !== undefined) {
            if (typeof cur.value !== 'object' && cur.value !== null) {
              if (!clause[cur.type.toLowerCase()]) { clause[cur.type.toLowerCase()] = [] }
              if (cur.type === "Identifier") {
                add_once(clause[cur.type.toLowerCase()], cur.value.split(".").pop())
              } else if (cur.type === "String") {
                add_once(clause[cur.type.toLowerCase()], cur.value.substring(1, cur.value.length - 1))
              } else {
                add_once(clause[cur.type.toLowerCase()], cur.value.toString())
              }
            }
          }
        }
        if (cur.alias) {
          if (!clause.alias) { clause.alias = [] }
          add_once(clause.alias, cur.alias)
        }
        if (cur.operator) {
          if (!clause.operator) { clause.operator = [] }
          add_once(clause.operator, cur.operator)
        }

      }
      if (Object(cur) !== cur) {
        //result[prop] = cur;

      } else if (Array.isArray(cur)) {
        for (var i = 0, l = cur.length; i < l; i++)
          recurse(cur[i], prop + "[" + i + "]");
        if (l === 0) {
          //result[prop] = [];
        }
      } else {
        var isEmpty = true;
        for (var p in cur) {
          isEmpty = false;
          recurse(cur[p], prop ? prop + "." + p : p);
        }
        if (isEmpty && prop) {
          //result[prop] = {};
        }
      }
    }
    recurse(ast.value.selectItems, "");
    return clause

  }

  function get_from_clause(ast) {
    const clause = {}

    function recurse(cur, prop) {// copied from flatten
      if (cur) {
        //logger.log("cur",cur,cur.operator,"==============================================================")()

        if (cur.type === "LeftRightJoinTable") {
          if (!clause.join) { clause.join = [] }
          add_once(clause.join, "outer join")
        }

        if (cur.type === "InnerCrossJoinTable") {
          if (!clause.join) { clause.join = [] }
          if (cur.innerCrossOpt === 'cross') {
            add_once(clause.join, "cross")
          } else {
            add_once(clause.join, "join")
          }
        }

        if (cur.type === "TableFactor") {
          if (!clause.table) { clause.table = [] }
          add_once(clause.table, cur.value.value)
        }


        if (cur.type === "OnJoinCondition") {
          if (!clause.column) { clause.column = [] }
          if (cur.value.left.type === "Identifier") {
            add_once(clause.column, cur.value.left.value.split(".").pop())
          }
          if (cur.value.right.type === "Identifier") {
            add_once(clause.column, cur.value.left.value.split(".").pop())
          }

        }


        if (cur.alias) {
          if (!clause.alias) { clause.alias = [] }
          add_once(clause.alias, cur.alias.value)
        }

      }
      if (Object(cur) !== cur) {
        //result[prop] = cur;

      } else if (Array.isArray(cur)) {
        for (var i = 0, l = cur.length; i < l; i++)
          recurse(cur[i], prop + "[" + i + "]");
        if (l === 0) {
          //result[prop] = [];
        }
      } else {
        var isEmpty = true;
        for (var p in cur) {
          isEmpty = false;
          recurse(cur[p], prop ? prop + "." + p : p);
        }
        if (isEmpty && prop) {
          //result[prop] = {};
        }
      }
    }
    recurse(ast.value.from, "");
    return clause

  }


  function get_order_clause(ast) {
    const clause = {}
    function recurse(cur, prop) {// copied from flatten
      if (cur) {
        if (cur.type === "GroupByOrderByItem") {
          if (cur.value && cur.value.type === "Identifier") {
            if (!clause.column) { clause.column = [] }
            if (cur.sortOpt && cur.sortOpt.toLowerCase() === "desc") {
              add_once(clause.column, cur.value.value.split(".").pop() + " DESC")
            } else {
              add_once(clause.column, cur.value.value.split(".").pop() + " ASC")
            }
          }
        }

      }
      if (Object(cur) !== cur) {
        //result[prop] = cur;

      } else if (Array.isArray(cur)) {
        for (var i = 0, l = cur.length; i < l; i++)
          recurse(cur[i], prop + "[" + i + "]");
        if (l === 0) {
          //result[prop] = [];
        }
      } else {
        var isEmpty = true;
        for (var p in cur) {
          isEmpty = false;
          recurse(cur[p], prop ? prop + "." + p : p);
        }
        if (isEmpty && prop) {
          //result[prop] = {};
        }
      }
    }
    recurse(ast.value.orderBy, "");
    return clause

  }


  function get_where_clause(ast) {
    const clause = {}
    function recurse(cur, prop) {// copied from flatten
      if (cur) {
        //logger.log("cur",cur,cur.operator,"==============================================================")()

        if (cur.type === "Identifier") {
          if (!clause.identifier) { clause.identifier = [] }
          add_once(clause.identifier, cur.value.split(".").pop())
        } else if (cur.type === "String") {
          if (!clause.string) { clause.string = [] }
          add_once(clause.string, cur.value.substring(1, cur.value.length - 1))
        } else if (cur.type === "Number") {
          if (!clause.number) { clause.number = [] }
          add_once(clause.number, cur.value)
        } else if (cur.type === "BetweenPredicate") {
          if (!clause.operator) { clause.operator = [] }
          add_once(clause.operator, "inequality operator (>, >=, <, <=, between)")
        }
        if (cur.operator) {
          if (!clause.operator) { clause.operator = [] }
          if (cur.operator.replace(">", "<").indexOf("<") > -1) {
            add_once(clause.operator, "inequality operator (>, >=, <, <=, between)")
          } else {
            add_once(clause.operator, cur.operator)
          }
        }
        if (cur.type === "LikePredicate") {
          if (!clause.operator) { clause.operator = [] }
          add_once(clause.operator, "Like")
        }
      }
      if (Object(cur) !== cur) {
        //result[prop] = cur;

      } else if (Array.isArray(cur)) {
        for (var i = 0, l = cur.length; i < l; i++)
          recurse(cur[i], prop + "[" + i + "]");
        if (l === 0) {
          //result[prop] = [];
        }
      } else {
        var isEmpty = true;
        for (var p in cur) {
          isEmpty = false;
          recurse(cur[p], prop ? prop + "." + p : p);
        }
        if (isEmpty && prop) {
          //result[prop] = {};
        }
      }
    }
    recurse(ast.value.where, "");
    return clause

  }



  function get_group_clause(ast) {
    const clause = {}
    function recurse(cur, prop) {// copied from flatten
      if (cur) {
        if (cur.type === "Identifier") {
          if (!clause.identifier) { clause.identifier = [] }
          add_once(clause.identifier, cur.value.split(".").pop())
        } else if (cur.type === "String") {
          if (!clause.string) { clause.string = [] }
          add_once(clause.string, cur.value.substring(1, cur.value.length - 1))
        } else if (cur.type === "Number") {
          if (!clause.number) { clause.number = [] }
          add_once(clause.number, cur.value)
        }
        if (cur.operator) {
          if (!clause.operator) { clause.operator = [] }
          add_once(clause.operator, cur.operator)
        }
      }
      if (Object(cur) !== cur) {
        //result[prop] = cur;

      } else if (Array.isArray(cur)) {
        for (var i = 0, l = cur.length; i < l; i++)
          recurse(cur[i], prop + "[" + i + "]");
        if (l === 0) {
          //result[prop] = [];
        }
      } else {
        var isEmpty = true;
        for (var p in cur) {
          isEmpty = false;
          recurse(cur[p], prop ? prop + "." + p : p);
        }
        if (isEmpty && prop) {
          //result[prop] = {};
        }
      }
    }
    recurse(ast.value.groupBy, "");
    return clause

  }


  function get_having_clause(ast) {
    const clause = {}
    function recurse(cur, prop) {// copied from flatten
      if (cur) {
        if (cur.type === "Identifier") {
          if (!clause.identifier) { clause.identifier = [] }
          add_once(clause.identifier, cur.value.split(".").pop())
        } else if (cur.type === "String") {
          if (!clause.string) { clause.string = [] }
          add_once(clause.string, cur.value.substring(1, cur.value.length - 1))
        } else if (cur.type === "Number") {
          if (!clause.number) { clause.number = [] }
          add_once(clause.number, cur.value)
        }
        if (cur.operator) {
          if (!clause.operator) { clause.operator = [] }
          add_once(clause.operator, cur.operator)
        }
      }
      if (Object(cur) !== cur) {
        //result[prop] = cur;

      } else if (Array.isArray(cur)) {
        for (var i = 0, l = cur.length; i < l; i++)
          recurse(cur[i], prop + "[" + i + "]");
        if (l === 0) {
          //result[prop] = [];
        }
      } else {
        var isEmpty = true;
        for (var p in cur) {
          isEmpty = false;
          recurse(cur[p], prop ? prop + "." + p : p);
        }
        if (isEmpty && prop) {
          //result[prop] = {};
        }
      }
    }
    recurse(ast.value.having, "");
    return clause

  }


  function get_limit_clause(ast) {
    let clause = null
    function recurse(cur, prop) {// copied from flatten
      if (cur) {
        if (cur.type === "Limit") {
          clause = cur.value[0]
        }
      }
      if (Object(cur) !== cur) {
        //result[prop] = cur;

      } else if (Array.isArray(cur)) {
        for (var i = 0, l = cur.length; i < l; i++)
          recurse(cur[i], prop + "[" + i + "]");
        if (l === 0) {
          //result[prop] = [];
        }
      } else {
        var isEmpty = true;
        for (var p in cur) {
          isEmpty = false;
          recurse(cur[p], prop ? prop + "." + p : p);
        }
        if (isEmpty && prop) {
          //result[prop] = {};
        }
      }
    }
    recurse(ast.value.limit, "");
    return clause

  }



  function add_once(array, value) { //add the value to the array if it is not already there
    if (array.indexOf(value) === -1) {
      array.push(value)
    }
  }

  return { parse }
}()

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