Bug : Fix date indexing

engine/src/main/java/com/google/android/fhir/db/impl/entities/DateIndexEntity.kt

@@ -27,7 +27,7 @@ import org.hl7.fhir.r4.model.ResourceType
 @Entity(
   indices =
     [
-      Index(value = ["resourceType", "index_name", "index_tsHigh", "index_tsLow"]),
+      Index(value = ["resourceType", "index_name", "index_from", "index_to"]),
       Index(
         // keep this index for faster foreign lookup
         value = ["resourceId", "resourceType"]

engine/src/main/java/com/google/android/fhir/index/ResourceIndexer.kt

@@ -98,9 +98,8 @@ internal object ResourceIndexer {
         DateIndex(
           name = "_lastUpdated",
           path = arrayOf(resource.fhirType(), "meta", "lastUpdated").joinToString(separator = "."),
-          tsHigh = lastUpdatedElement.value.time,
-          tsLow = lastUpdatedElement.value.time,
-          temporalPrecision = lastUpdatedElement.precision
+          from = lastUpdatedElement.value.time,
+          to = lastUpdatedElement.precision.add(lastUpdatedElement.value, 1).time
         )
       )
     }
@@ -124,8 +123,7 @@ internal object ResourceIndexer {
           searchParam.name,
           searchParam.path,
           date.value.time,
-          date.value.time,
-          date.precision
+          date.precision.add(date.value, 1).time
         )
       }
       "dateTime" -> {
@@ -134,44 +132,31 @@ internal object ResourceIndexer {
           searchParam.name,
           searchParam.path,
           dateTime.value.time,
-          dateTime.value.time,
-          dateTime.precision
+          dateTime.precision.add(dateTime.value, 1).time
         )
       }
+      // No need to add precision because an instant is meant to have zero width
       "instant" -> {
         val instant = value as InstantType
-        DateIndex(
-          searchParam.name,
-          searchParam.path,
-          instant.value.time,
-          instant.value.time,
-          instant.precision
-        )
+        DateIndex(searchParam.name, searchParam.path, instant.value.time, instant.value.time)
       }
       "Period" -> {
         val period = value as Period
         DateIndex(
           searchParam.name,
           searchParam.path,
-          if (period.hasEnd()) period.end.time else Long.MAX_VALUE,
-          if (period.hasStart()) period.start.time else Long.MIN_VALUE,
-          when {
-            (period.hasEnd() and period.hasStart()) ->
-              maxOf(period.startElement.precision, period.endElement.precision)
-            (period.hasEnd()) -> period.endElement.precision
-            (period.hasStart()) -> period.startElement.precision
-            else -> DateTimeType.DEFAULT_PRECISION
-          }
+          if (period.hasStart()) period.start.time else 0,
+          if (period.hasEnd()) period.endElement.precision.add(period.end, 1).time
+          else Long.MAX_VALUE
         )
       }
       "Timing" -> {
         val timing = value as Timing
         DateIndex(
           searchParam.name,
           searchParam.path,
-          timing.event.maxOf { it.value.time },
           timing.event.minOf { it.value.time },
-          timing.event.maxOf { it.precision }
+          timing.event.maxOf { it.precision.add(it.value, 1).time }
         )
       }
       else -> null

engine/src/main/java/com/google/android/fhir/index/entities/DateIndex.kt

@@ -16,8 +16,6 @@
 
 package com.google.android.fhir.index.entities
 
-import ca.uhn.fhir.model.api.TemporalPrecisionEnum
-
 /**
  * An index record for a date value in a resource.
  *
@@ -28,13 +26,14 @@ internal data class DateIndex(
   val name: String,
   /** The path of the date index, e.g. "Patient.birthdate". */
   val path: String,
-  /** The high timestamp. */
-  val tsHigh: Long,
-  /** The low timestamp. */
-  val tsLow: Long,
   /**
-   * The smallest value we can unambiguously resolve the date to. This is an indication to clients
-   * that any part of the timestamp smaller than the [temporalPrecision] should be ignored.
+   * The lower bound or start time of the date value. This is a closed interval and the value is
+   * included
+   */
+  val from: Long,
+  /**
+   * The upper bound or end time of the date value. This is an open interval and the value is
+   * excluded
    */
-  val temporalPrecision: TemporalPrecisionEnum
+  val to: Long
 )

engine/src/test/java/com/google/android/fhir/index/ResourceIndexerTest.kt

@@ -218,9 +218,8 @@ class ResourceIndexerTest {
         DateIndex(
           "date",
           "Observation.effective",
-          periodElement.end.time,
           periodElement.start.time,
-          periodElement.startElement.precision
+          periodElement.endElement.precision.add(periodElement.end, 1).time
         )
       )
   }
@@ -235,8 +234,7 @@ class ResourceIndexerTest {
           "date",
           "Observation.effective",
           dateTimeTypeElement.value.time,
-          dateTimeTypeElement.value.time,
-          dateTimeTypeElement.precision
+          dateTimeTypeElement.precision.add(dateTimeTypeElement.value, 1).time
         )
       )
   }
@@ -250,9 +248,8 @@ class ResourceIndexerTest {
         DateIndex(
           "date",
           "Observation.effective",
-          timingElement.event.maxOf { it.value.time },
           timingElement.event.minOf { it.value.time },
-          timingElement.event.maxOf { it.precision }
+          timingElement.event.maxOf { it.precision.add(it.value, 1).time }
         )
       )
   }
@@ -266,8 +263,7 @@ class ResourceIndexerTest {
           "date",
           "Observation.effective",
           instantElement.value.time,
-          instantElement.value.time,
-          instantElement.precision
+          instantElement.value.time
         )
       )
   }
@@ -333,9 +329,8 @@ class ResourceIndexerTest {
         DateIndex(
           "birthdate",
           "Patient.birthDate",
-          birthDateElement.getValue().getTime(),
-          birthDateElement.getValue().getTime(),
-          birthDateElement.getPrecision()
+          birthDateElement.value.time,
+          birthDateElement.precision.add(birthDateElement.value, 1).time
         )
       )
   }
@@ -350,8 +345,7 @@ class ResourceIndexerTest {
           "_lastUpdated",
           "Patient.meta.lastUpdated",
           lastUpdatedElement.getValue().getTime(),
-          lastUpdatedElement.getValue().getTime(),
-          lastUpdatedElement.getPrecision()
+          lastUpdatedElement.precision.add(lastUpdatedElement.getValue(), 1).time
         )
       )
   }