Function replaceGroupByRefsInExpression

packages/db/src/query/compiler/group-by.ts:826–849

(
  expr: BasicExpression,
  groupByClause: GroupBy,
)

}

function replaceGroupByRefsInExpression(
  expr: BasicExpression,
  groupByClause: GroupBy,
): BasicExpression {
  if (expr.type === `ref`) {
    const groupIndex = groupByClause.findIndex((groupExpr) =>
      expressionsEqual(expr, groupExpr),
    )
    return groupIndex === -1
      ? expr
      : new PropRef([`$selected`, `${GROUP_KEY_REF_PREFIX}${groupIndex}`])
  }

  if (expr.type === `func`) {
    return new Func(
      expr.name,
      expr.args.map((arg) =>
        replaceGroupByRefsInExpression(arg, groupByClause),
      ),
    )
  }

  return expr
}

function compileGroupedSelectValue(
  value: SelectValueExpression,