Release 386 (15 Jun 2022)

General

• Improve out-of-the-box performance of queries when task retry policy is enabled. ({issue}12646)
• Improve query latency when task retry policy is enabled. ({issue}12615)

JDBC driver

• Add configuration property assumeLiteralUnderscoreInMetadataCallsForNonConformingClients for situations where applications do not properly escape schema or table names in calls to DatabaseMetaData. ({issue}12672)

Accumulo connector

• Disallow creating a view in a non-existent schema. ({issue}12475)

Delta Lake connector

• Improve query performance on tables with many small files. ({issue}12755)
• Disallow reading tables if delta.columnMapping.mode table property is specified. ({issue}12621)
• Set a target maximum file size during table writes. The default is 1 GB and can be configured with the target_max_file_size session property or the target-max-file-size configuration property. ({issue}12820)

Hive connector

• Fix incompatibility with Apache Hive when writing decimal values with precision of 18 or less with the experimental Parquet writer. ({issue}12658)
• Fix potential query failure when using schema evolution with union-typed columns. ({issue}12520)
• Fix potential query failure when reading timestamp(6) with time zone values. ({issue}12804)

Iceberg connector

• Disallow creating a table with a pre-existing destination location. ({issue}12573)
• Fix NoClassDefFoundError query failure when using Google Cloud Storage. ({issue}12674)
• Fix ClassNotFoundException: Class io.trino.plugin.hive.s3.TrinoS3FileSystem error when querying information_schema.columns. ({issue}12676)
• Avoid creating a table snapshot when a write statement does not change the table state. ({issue}12319)
• Fix incorrect query results when filtering on $path synthetic column and on at least one other column. ({issue}12790)
• Fix potential query failure when reading timestamp(6) with time zone values. ({issue}12804)
• Fix query failure when using the [VERSION | TIMESTAMP] AS OF clause on a table with redirection. ({issue}12542)
• Fix query failure when reading a timestamp(p) with time zone value before 1970 from a Parquet file. ({issue}12852)

Kafka connector

• Fix failure when decoding a float value to real type. ({issue}12784)

Phoenix connector

• Remove support for Phoenix 4. ({issue}12772)

SPI

• Add new version of getStatisticsCollectionMetadata() to ConnectorMetadata which returns ConnectorAnalyzeMetadata. Deprecate the existing method and getTableHandleForStatisticsCollection(). ({issue}12388)
• Remove deprecated ConnectorMetadata.getTableStatistics method. ({issue}12489)