lib/connection/result/chunk.js
function resolveColumnIdentifierToColumn(
    columns, columnIdentifier, mapColumnNameToIndices)
{
  var columnIndex;

  // if the column identifier is a string, treat it as a column
  // name and use it to get the index of the specified column
  if (Util.isString(columnIdentifier))
  {
    // if a valid column name was specified, get the index of the first column
    // with the specified name
    if (mapColumnNameToIndices.hasOwnProperty(columnIdentifier))
    {
      columnIndex = mapColumnNameToIndices[columnIdentifier][0];
    }
  }
  // if the column identifier is a number, treat it as a column index
  else if (Util.isNumber(columnIdentifier))
  {
    columnIndex = columnIdentifier;
  }

  return columns[columnIndex];
}
function resolveColumnIdentifierToColumn(
    columns, columnIdentifier, mapColumnNameToIndices)
{
  var columnIndex;

  // if the column identifier is a string, treat it as a column
  // name and use it to get the index of the specified column
  if (Util.isString(columnIdentifier))
  {
    // if a valid column name was specified, get the index of the first column
    // with the specified name
    if (mapColumnNameToIndices.hasOwnProperty(columnIdentifier))
    {
      columnIndex = mapColumnNameToIndices[columnIdentifier][0];
    }
  }
  // if the column identifier is a number, treat it as a column index
  else if (Util.isNumber(columnIdentifier))
  {
    columnIndex = columnIdentifier;
  }

  return columns[columnIndex];
}
function resolveColumnIdentifierToColumn ( columns , columnIdentifier , mapColumnNameToIndices ) { var columnIndex ; // if the column identifier is a string, treat it as a column // name and use it to get the index of the specified column if ( Util . isString ( columnIdentifier ) ) { // if a valid column name was specified, get the index of the first column // with the specified name if ( mapColumnNameToIndices . hasOwnProperty ( columnIdentifier ) ) { columnIndex = mapColumnNameToIndices [ columnIdentifier ] [ 0 ] ; } } // if the column identifier is a number, treat it as a column index else if ( Util . isNumber ( columnIdentifier ) ) { columnIndex = columnIdentifier ; } return columns [ columnIndex ] ; }
Resolves a column identifier to the corresponding column if possible. The
column identifier can be a column name or a column index. If an invalid
column identifier is specified, we return undefined.

@param {Object[]} columns
@param {String | Number} columnIdentifier
@param {Object} mapColumnNameToIndices

@returns {*}
Resolves a column identifier to the corresponding column if possible . The column identifier can be a column name or a column index . If an invalid column identifier is specified we return undefined .