gatsby graphql queries grouping vs aliases

export const query = graphql`
  query {
    post: allMarkdownRemark(
      limit: 3
      sort: { order: DESC, fields: [frontmatter___date] }
      filter: { frontmatter: { type: { ne: "portfolio" } } }
    ) {
      edges {
        node {
          timeToRead
          frontmatter {
            title
            path
            date(formatString: "DD MMMM YYYY")
            summary
            images
            tags
            type
          }
        }
      }
    }
    portfolio: allMarkdownRemark(
      sort: { order: DESC, fields: [frontmatter___date] }
      filter: { frontmatter: { type: { eq: "portfolio" } } }
    ) {
      edges {
        node {
          frontmatter {
            title
            path
            images
            tags
            type
          }
        }
      }
    }
    siteMetaData: site {
      siteMetadata {
        title
      }
    }
  }
`;