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[SPARK-21510] Add isMaterialized() and eager persist() to Dataset APIs - Spark - [issue]
...Currently, when using Spark, the beginners do not realize our persist API is lazy. They do not know what is the most efficient way to materialize it. Sometimes, they just use collect(), whic...    Author: Xiao Li , 2019-09-16, 19:28
[SPARK-14922] Alter Table Drop Partition Using Predicate-based Partition Spec - Spark - [issue]
...Below is allowed in Hive, but not allowed in Spark.alter table ptestfilter drop partition (c='US', d<'2')This example is copied from drop_partitions_filter.q...    Author: Xiao Li , 2019-09-16, 19:19
[SPARK-25121] Support multi-part column name for hint resolution - Spark - [issue]
...After supporting multi-part names in, we also need to consider how to resolve the hints for broadcast hints....    Author: Xiao Li , 2019-09-16, 19:12
[SPARK-26820] Issue Error/Warning when Hint is not applicable - Spark - [issue]
...We should issue an error or a warning when the HINT is not applicable. This should be configurable....    Author: Xiao Li , 2019-09-16, 19:04
[SPARK-27946] Hive DDL to Spark DDL conversion USING "show create table" - Spark - [issue]
...Many users migrate tables created with Hive DDL to Spark. Defining the table with Spark DDL brings performance benefits. We need to add a feature to Show Create Table that allows you to gene...    Author: Xiao Li , 2019-09-16, 18:58
[SPARK-28476] Support ALTER DATABASE SET LOCATION - Spark - [issue]
...We can support the syntax of ALTER (DATABASE|SCHEMA) database_name SET LOCATION pathRef: ...    Author: Xiao Li , 2019-09-16, 18:53
[SPARK-27972] Move SQL migration guide to the top level - Spark - [issue]
...Currently, only SQL and MLLib  have the dedicated section for documenting behavior changes and breaking changes. We found these guides simplify the upgrade experience for end users. https://...    Author: Xiao Li , 2019-09-16, 05:08
[SPARK-29092] EXPLAIN FORMATTED does not work well with DPP - Spark - [issue]
... withSQLConf(SQLConf.DYNAMIC_PARTITION_PRUNING_ENABLED.key -> "true",  SQLConf.DYNAMIC_PARTITION_PRUNING_REUSE_BROADCAST.key -> "false") {  withTable("df1", "df2") {  &n...    Author: Xiao Li , 2019-09-16, 04:53
[SPARK-27596] The JDBC 'query' option doesn't work for Oracle database - Spark - [issue]
...For the JDBC option `query`, we use the identifier name to start with underscore: s"(${subquery}) _SPARK_GEN_JDBC_SUBQUERY_NAME${curId.getAndIncrement()}". This is not supported by Oracle. T...    Author: Xiao Li , 2019-09-16, 01:12
[SPARK-21878] Create SQLMetricsTestUtils - Spark - [issue]
...Creates `SQLMetricsTestUtils` for the utility functions of both Hive-specific and the other SQLMetrics test cases. Also, move two SQLMetrics test cases from sql/hive to sql/core....    Author: Xiao Li , 2019-09-14, 21:54