[8.x] [ESQL] test date nanos union type (elastic#116265) (elastic#116602)

* [ESQL] test date nanos union type (elastic#116265)

Resolves elastic#112885

This PR adds a bunch of basic testing for using TO_DATE_NANOS as a union type. It also tests the TO_DATETIME union type for casting date nanos. There are still some cases that aren't covered here, mostly because we haven't finished adding date nanos support to all the relevant functions. I expect we'll add in those cases as we add functions support.

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Co-authored-by: Elastic Machine <[email protected]>

* add capability check

* add capability check

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Co-authored-by: Elastic Machine <[email protected]>

Author: not-napoleon

x-pack/plugin/esql/qa/testFixtures/src/main/java/org/elasticsearch/xpack/esql/CsvTestUtils.java

@@ -13,6 +13,7 @@
 import org.elasticsearch.common.breaker.NoopCircuitBreaker;
 import org.elasticsearch.common.network.InetAddresses;
 import org.elasticsearch.common.time.DateFormatters;
+import org.elasticsearch.common.time.DateUtils;
 import org.elasticsearch.common.util.BigArrays;
 import org.elasticsearch.compute.data.Block;
 import org.elasticsearch.compute.data.BlockFactory;
@@ -471,7 +472,7 @@ public enum Type {
                 return null;
             }
             Instant parsed = DateFormatters.from(ISO_DATE_WITH_NANOS.parse(x)).toInstant();
-            return parsed.getEpochSecond() * 1_000_000_000 + parsed.getNano();
+            return DateUtils.toLong(parsed);
         }, (l, r) -> l instanceof Long maybeIP ? maybeIP.compareTo((Long) r) : l.toString().compareTo(r.toString()), Long.class),
         BOOLEAN(Booleans::parseBoolean, Boolean.class),
         GEO_POINT(x -> x == null ? null : GEO.wktToWkb(x), BytesRef.class),

x-pack/plugin/esql/qa/testFixtures/src/main/java/org/elasticsearch/xpack/esql/CsvTestsDataLoader.java

@@ -64,6 +64,9 @@ public class CsvTestsDataLoader {
     private static final TestsDataset SAMPLE_DATA_TS_LONG = SAMPLE_DATA.withIndex("sample_data_ts_long")
         .withData("sample_data_ts_long.csv")
         .withTypeMapping(Map.of("@timestamp", "long"));
+    private static final TestsDataset SAMPLE_DATA_TS_NANOS = SAMPLE_DATA.withIndex("sample_data_ts_nanos")
+        .withData("sample_data_ts_nanos.csv")
+        .withTypeMapping(Map.of("@timestamp", "date_nanos"));
     private static final TestsDataset MISSING_IP_SAMPLE_DATA = new TestsDataset("missing_ip_sample_data");
     private static final TestsDataset CLIENT_IPS = new TestsDataset("clientips");
     private static final TestsDataset CLIENT_CIDR = new TestsDataset("client_cidr");
@@ -101,6 +104,7 @@ public class CsvTestsDataLoader {
         Map.entry(ALERTS.indexName, ALERTS),
         Map.entry(SAMPLE_DATA_STR.indexName, SAMPLE_DATA_STR),
         Map.entry(SAMPLE_DATA_TS_LONG.indexName, SAMPLE_DATA_TS_LONG),
+        Map.entry(SAMPLE_DATA_TS_NANOS.indexName, SAMPLE_DATA_TS_NANOS),
         Map.entry(MISSING_IP_SAMPLE_DATA.indexName, MISSING_IP_SAMPLE_DATA),
         Map.entry(CLIENT_IPS.indexName, CLIENT_IPS),
         Map.entry(CLIENT_CIDR.indexName, CLIENT_CIDR),

x-pack/plugin/esql/qa/testFixtures/src/main/resources/sample_data_ts_nanos.csv

@@ -0,0 +1,8 @@
+@timestamp:date_nanos,client_ip:ip,event_duration:long,message:keyword
+2023-10-23T13:55:01.543123456Z,172.21.3.15,1756467,Connected to 10.1.0.1
+2023-10-23T13:53:55.832123456Z,172.21.3.15,5033755,Connection error
+2023-10-23T13:52:55.015123456Z,172.21.3.15,8268153,Connection error
+2023-10-23T13:51:54.732123456Z,172.21.3.15,725448,Connection error
+2023-10-23T13:33:34.937123456Z,172.21.0.5,1232382,Disconnected
+2023-10-23T12:27:28.948123456Z,172.21.2.113,2764889,Connected to 10.1.0.2
+2023-10-23T12:15:03.360123456Z,172.21.2.162,3450233,Connected to 10.1.0.3