#14327: sqlite-autoconf-3340000 (3.34.0)
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Reporter: bdubbs | Owner: bdubbs
Type: enhancement | Status: assigned
Priority: normal | Milestone: 10.1
Component: BOOK | Version: SVN
Severity: normal | Resolution:
Keywords: |
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Comment (by bdubbs):
SQLite Release 3.34.0 On 2020-12-04
- Added the sqlite3_txn_state() interface for reporting on the current
transaction state of the database connection.
- Enhance recursive common table expressions to support two or more
recursive terms as is done by SQL Server, since this helps make queries
against graphs easier to write and faster to execute.
- Improved error messages on CHECK constraint failures.
- CLI enhancements:
- The .read dot-command now accepts a pipeline in addition to a
filename.
- Added options --data-only and --nosys to the .dump dot-command.
- Added the --nosys option to the .schema dot-command.
- Table name quoting works correctly for the .import dot-command.
- The generate_series(START,END,STEP) table-valued function
extension is now built into the CLI.
- The .databases dot-command now show the status of each database
file as determined by sqlite3_db_readonly() and sqlite3_txn_state().
- Added the --tabs command-line option that sets .mode tabs.
- The --init option reports an error if the file named as its
argument cannot be opened. The --init option also now honors the --bail
option.
- Query planner improvements:
- Improved estimates for the cost of running a DISTINCT operator.
- When doing an UPDATE or DELETE using a multi-column index where
only a few of the earlier columns of the index are useful for the index
lookup, postpone doing the main table seek until after all WHERE clause
constraints have been evaluated, in case those constraints can be covered
by unused later terms of the index, thus avoiding unnecessary main table
seeks.
- The new OP_SeekScan opcode is used to improve performance of
multi-column index look-ups when later columns are constrained by an IN
operator.
- The BEGIN IMMEDIATE and BEGIN EXCLUSIVE commands now work even if one
or more attached database files are read-only.
- Enhanced FTS5 to support trigram indexes.
- Improved performance of WAL mode locking primitives in cases where
there are hundreds of connections all accessing the same database file at
once.
- Enhanced the carray() table-valued function to include a single-
argument form that is bound using the auxiliary sqlite3_carray_bind()
interface.
- The substr() SQL function can now also be called "substring()" for
compatibility with SQL Server.
- The syntax diagrams are now implemented as Pikchr scripts and
rendered as SVG for improved legibility and ease of maintenance.
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