function decodeColumns()

in backend/columnar.js [577:607]

• 30 lines of code
• 7 McCabe index (conditional complexity)

function decodeColumns(columns, actorIds, columnSpec) {
  columns = makeDecoders(columns, columnSpec)
  let parsedRows = []
  while (columns.some(col => !col.decoder.done)) {
    let row = {}, col = 0
    while (col < columns.length) {
      const columnId = columns[col].columnId
      let groupId = columnId >> 4, groupCols = 1
      while (col + groupCols < columns.length && columns[col + groupCols].columnId >> 4 === groupId) {
        groupCols++
      }

      if (columnId % 8 === COLUMN_TYPE.GROUP_CARD) {
        const values = [], count = columns[col].decoder.readValue()
        for (let i = 0; i < count; i++) {
          let value = {}
          for (let colOffset = 1; colOffset < groupCols; colOffset++) {
            decodeValueColumns(columns, col + colOffset, actorIds, value)
          }
          values.push(value)
        }
        row[columns[col].columnName] = values
        col += groupCols
      } else {
        col += decodeValueColumns(columns, col, actorIds, row)
      }
    }
    parsedRows.push(row)
  }
  return parsedRows
}