Increase default delta.metadata.cache-ttl to 30m

TTL can be higher because the cached metadata is immutable
and the space occupied by it in memory is accounted for

docs/src/main/sphinx/connector/delta-lake.md

@@ -83,9 +83,8 @@ values. Typical usage does not require you to configure them.
   - Description
   - Default
 * - `delta.metadata.cache-ttl`
-  - Frequency of checks for metadata updates equivalent to transactions to
-    update the metadata cache specified in [](prop-type-duration).
-  - `5m`
+  - Caching duration for Delta Lake tables metadata.
+  - `30m`
 * - `delta.metadata.cache-max-retained-size`
   - Maximum retained size of Delta table metadata stored in cache. Must be
     specified in [](prop-type-data-size) values such as `64MB`. Default is

plugin/trino-delta-lake/src/main/java/io/trino/plugin/deltalake/DeltaLakeConfig.java

@@ -58,7 +58,7 @@ public class DeltaLakeConfig
     @VisibleForTesting
     static final DataSize DEFAULT_METADATA_CACHE_MAX_RETAINED_SIZE = DataSize.succinctBytes(Math.floorDiv(Runtime.getRuntime().maxMemory(), 20L));
 
-    private Duration metadataCacheTtl = new Duration(5, TimeUnit.MINUTES);
+    private Duration metadataCacheTtl = new Duration(30, TimeUnit.MINUTES);
     private DataSize metadataCacheMaxRetainedSize = DEFAULT_METADATA_CACHE_MAX_RETAINED_SIZE;
     private DataSize dataFileCacheSize = DEFAULT_DATA_FILE_CACHE_SIZE;
     private Duration dataFileCacheTtl = new Duration(30, TimeUnit.MINUTES);

plugin/trino-delta-lake/src/test/java/io/trino/plugin/deltalake/TestDeltaLakeConfig.java

@@ -42,7 +42,7 @@ public void testDefaults()
         assertRecordedDefaults(recordDefaults(DeltaLakeConfig.class)
                 .setDataFileCacheSize(DeltaLakeConfig.DEFAULT_DATA_FILE_CACHE_SIZE)
                 .setDataFileCacheTtl(new Duration(30, MINUTES))
-                .setMetadataCacheTtl(new Duration(5, TimeUnit.MINUTES))
+                .setMetadataCacheTtl(new Duration(30, TimeUnit.MINUTES))
                 .setMetadataCacheMaxRetainedSize(DeltaLakeConfig.DEFAULT_METADATA_CACHE_MAX_RETAINED_SIZE)
                 .setDomainCompactionThreshold(1000)
                 .setMaxSplitsPerSecond(Integer.MAX_VALUE)