This adds the .dir-locals.el Emacs style settings file from the
PostgreSQL source. This will make it easier for Emacs users to
conform to the official PostgreSQL coding style.
This patch refactors the source code so that a bunch of unrelated code
for the planner, process utilities and transaction management, which
was previously located in the common file timescaledb.c, is now broken
up into separate source files.
Currently, the internal metadata tables for hypertables track time
as a BIGINT integer. Converting hypertable time columns in TIMESTAMP
format to this internal representation requires using Postgres' conversion
functions that are imprecise due to floating-point arithmetic. This patch
adds C-based conversion functions that offer the following conversions
using accurate integer arithmetic:
- TIMESTAMP to UNIX epoch BIGINT in microseconds
- UNIX epoch BIGINT in microseconds to TIMESTAMP
- TIMESTAMP to Postgres epoch BIGINT in microseconds
- Postgres epoch BIGINT in microseconds to TIMESTAMP
The downside of the UNIX epoch functions are that they don't offer the full
date range as offered by the Postgres to_timestamp() function. This is
because of the required epoch shift might otherwise overflow the BIGINT.
All functions should, however, offer appropriate range checks and will
throw errors if outside the range.
