Explore parameters

## STRUCTURAL PARAMETERS

explore: explore_name {
  extension: required
  extends: [explore_name,  explore_name, ...]
  fields: [field_or_set, field_or_set, ...]
  tags: ["string1", "string2", ...]

  # DISPLAY PARAMETERS
  description: "Description I want"
  group_label: "Label to use as a heading in the Explore menu"
  hidden: yes | no
  label: "desired label"
  query:  {
      # Desired query parameters (described on the query page)      }
  view_label: "Field picker heading I want for the Explore's fields"

  # FILTER PARAMETERS

  access_filter: {
    field: fully_scoped_field
    user_attribute: user_attribute_name
  }

  # Possibly more access_filter declarations

  always_filter: {
    filters: [field_name: "filter expression", field_name: "filter expression", ...]
  }
  case_sensitive: yes | no
  conditionally_filter: {
    filters: [field_name: "filter expression", field_name: "filter expression", ...]
    unless: [field_name, field_name, ...]
  }
  sql_always_having: SQL HAVING condition ;;
  sql_always_where: SQL WHERE condition ;;

  # JOIN PARAMETERS

  always_join: [view_name, view_name, ...]
  join: view_name {
    # Desired join parameters (described on Join Parameters page)
  }
  # Possibly more join declarations

  # QUERY PARAMETERS

  cancel_grouping_fields: [fully_scoped_field, fully_scoped_field, ...]
  from: view_name
  persist_for: "N (seconds | minutes | hours)"
  persist_with: datagroup_name
  required_access_grants: [access_grant_name, access_grant_name, ...]
  sql_table_name: table_name ;;
  symmetric_aggregates: yes | no
  view_name: view_name

  # AGGREGATE TABLE PARAMETERS

  aggregate_table: table_name {
    query:  {
      # Desired query parameters (described on the aggregate_table page)
    }
    materialization:  {
      # Desired materialization parameters (described on the aggregate_table page)
    }
  }
  # Possibly more aggregate_table declarations
}

## REFINEMENT PARAMETERS

explore: +explore_name {
  final: yes
}