COUNT(*) Warning breaking Pushdown queries

[pauldheinrichs]

Describe the bug
A clear and concise description of what the bug is.

Since this PR has been merged - querying in the BI tool to check counts results in an error rather than getting a count. With pushdown enabled - i wouldn't have anticipated this would be the expected flow if a count measure didn't exist.

---

If this is the expected outcome, then feel free to close!

cube(`Orders`, {
  sql: `
  select 1 as id, 100 as amount, 'new' status
  UNION ALL
  select 2 as id, 200 as amount, 'new' status
  UNION ALL
  select 3 as id, 300 as amount, 'processed' status
  UNION ALL
  select 4 as id, 500 as amount, 'processed' status
  UNION ALL
  select 5 as id, 600 as amount, 'shipped' status
  `,
  measures: {
    count: {
      type: `count`,
    },
    totalAmount: {
      sql: `amount`,
      type: `sum`,
    },
    toRemove: {
      type: `count`,
    },
  },
  dimensions: {
    status: {
      sql: `status`,
      type: `string`,
    },
  },
});


view(`orders_view`, {
  cubes: [
    {
      join_path: Orders,
      prefix: true,
      includes: `*`
    },
}

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When doing a select count(*) on the orders_View it will error out..