Fix LookML parser edge cases from real-world fixtures

tests/fixtures/lookml/edge_cases_extends.lkml

@@ -0,0 +1,169 @@
+# Edge Cases: View Extends and Refinements
+# Tests LookML inheritance patterns that parsers commonly struggle with
+
+# Base view for inheritance testing
+view: base_entity {
+  sql_table_name: analytics.entities ;;
+  description: "Base entity with common fields"
+
+  dimension: id {
+    type: number
+    primary_key: yes
+    sql: ${TABLE}.id ;;
+  }
+
+  dimension: name {
+    type: string
+    sql: ${TABLE}.name ;;
+  }
+
+  dimension: is_active {
+    type: yesno
+    sql: ${TABLE}.is_active ;;
+  }
+
+  dimension_group: created {
+    type: time
+    timeframes: [date, week, month, year]
+    sql: ${TABLE}.created_at ;;
+  }
+
+  measure: count {
+    type: count
+    description: "Total count"
+  }
+}
+
+# View that extends base_entity
+view: customers_extended {
+  extends: [base_entity]
+  sql_table_name: analytics.customers ;;
+  description: "Customer entity extending base"
+
+  # Override the name dimension from base
+  dimension: name {
+    label: "Customer Name"
+    sql: CONCAT(${TABLE}.first_name, ' ', ${TABLE}.last_name) ;;
+  }
+
+  # Add new customer-specific dimensions
+  dimension: email {
+    type: string
+    sql: ${TABLE}.email ;;
+  }
+
+  dimension: tier {
+    type: string
+    sql: ${TABLE}.tier ;;
+    suggestions: ["bronze", "silver", "gold", "platinum"]
+  }
+
+  dimension: lifetime_value {
+    type: number
+    sql: ${TABLE}.ltv ;;
+    value_format_name: usd
+  }
+
+  # Add new measures
+  measure: total_ltv {
+    type: sum
+    sql: ${lifetime_value} ;;
+    value_format_name: usd
+  }
+
+  measure: avg_ltv {
+    type: average
+    sql: ${lifetime_value} ;;
+    value_format_name: usd
+  }
+}
+
+# Refinement syntax (LookML plus notation)
+view: +base_entity {
+  # Refinements add to the base view without extending
+  dimension: refined_field {
+    type: string
+    sql: ${TABLE}.refined_field ;;
+    description: "Added via refinement"
+  }
+}
+
+# View with multiple extends
+view: multi_extend_view {
+  extends: [base_entity]
+  sql_table_name: analytics.multi_entities ;;
+
+  dimension: extra_id {
+    type: string
+    sql: ${TABLE}.external_id ;;
+    description: "External system identifier"
+  }
+
+  dimension: metadata {
+    type: string
+    sql: ${TABLE}.metadata ;;
+  }
+
+  measure: unique_external_ids {
+    type: count_distinct
+    sql: ${extra_id} ;;
+  }
+}
+
+# Abstract view (meant only to be extended, not used directly)
+view: abstract_metrics {
+  extension: required
+  description: "Abstract view containing reusable metric definitions"
+
+  measure: record_count {
+    type: count
+  }
+
+  measure: sum_amount {
+    type: sum
+    sql: ${TABLE}.amount ;;
+  }
+
+  measure: avg_amount {
+    type: average
+    sql: ${TABLE}.amount ;;
+  }
+
+  measure: min_amount {
+    type: min
+    sql: ${TABLE}.amount ;;
+  }
+
+  measure: max_amount {
+    type: max
+    sql: ${TABLE}.amount ;;
+  }
+}
+
+# Concrete view extending abstract
+view: transactions {
+  extends: [abstract_metrics]
+  sql_table_name: analytics.transactions ;;
+
+  dimension: id {
+    type: number
+    primary_key: yes
+    sql: ${TABLE}.id ;;
+  }
+
+  dimension: amount {
+    type: number
+    sql: ${TABLE}.amount ;;
+  }
+
+  dimension: status {
+    type: string
+    sql: ${TABLE}.status ;;
+  }
+
+  dimension_group: transaction {
+    type: time
+    timeframes: [time, date, week, month, quarter, year]
+    sql: ${TABLE}.transaction_at ;;
+  }
+}