parser: change copy from/to to support "<tablename> PARTITION (...)" clauses
make ExpressionTo*Visitor singleton
change refresh table for partitions to use new synopsis
add support for the PARTITION keyword in the copy from statement
add partition clause to the copy to statement
support COPY TO on partitioned tables without partition clause
add ArrayLiteral and ObjectLiteral to parser
implemented analysis of array and object literals
slight improvement to copy to description
added documentation for array and object literals
added partition clause to alter table stmt in parser
implemented alter table on single partitions
increase version to 0.39.0 SNAPSHOT for feature branch
updated changes for story branch
update parser tests for refresh on partition
fix copy analysis and projections to use ColumnIdents instead of strings
Merge pull request #817 from crate/partition_copy

Partition copy
add arithmetic functions