SQLite Release 3.19.0 On 2017-05-22

• The SQLITE_READ authorizer callback is invoked once with a column name that is an empty string for every table referenced in a query from which no columns are extracted.
• When using an index on an expression, try to use expression values already available in the index, rather than loading the original columns and recomputing the expression.
• Enhance the flattening optimization so that it is able to flatten views on the right-hand side of a LEFT JOIN.
• Use replace() instead of char() for escaping newline and carriage-return characters embedded in strings in the .dump output from the command-line shell.
• Avoid unnecessary foreign key processing in UPDATE statements that do not touch the columns that are constrained by the foreign keys.
• On a DISTINCT query that uses an index, try to skip ahead to the next distinct entry using the index rather than stepping through rows, when an appropriate index is available.
• Avoid unnecessary invalidation of sqlite3_blob handles when making changes to unrelated tables.
• Transfer any terms of the HAVING clause that use only columns mentioned in the GROUP BY clause over to the WHERE clause for faster processing.
• Reuse the same materialization of a VIEW if that VIEW appears more than once in the same query.
• Enhance PRAGMA integrity_check so that it identifies tables that have two or more rows with the same rowid.
• Enhance the FTS5 query syntax so that column filters may be applied to arbitrary expressions.
• Enhance the json_extract() function to cache and reuse parses of JSON input text.
• Added the anycollseq.c loadable extension that allows a generic SQLite database connection to read a schema that contains unknown and/or application-specific collating sequences.

  Bug Fixes:

• Fix a problem in REPLACE that can result in a corrupt database containing two or more rows with the same rowid. Fix for ticket f68dc596c4e6018d.
• Fix a problem in PRAGMA integrity_check that was causing a subsequent VACUUM to behave suboptimally.
• Fix the PRAGMA foreign_key_check command so that it works correctly with foreign keys on WITHOUT ROWID tables.
• Disallow leading zeros in numeric constants in JSON. Fix for ticket b93be8729a895a528e2.
• Disallow control characters inside of strings in JSON. Fix for ticket 6c9b5514077fed34551.
• Limit the depth of recursion for JSON objects and arrays in order to avoid excess stack usage in the recursive descent parser. Fix for ticket 981329adeef51011052.

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