Split off candidate-4.2.8

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
HPCC-11464 Default string stored definitions to variable length

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
HPCC-11441 Fold IF() at parse time to avoid binding issues later

* Note this also speeds parsing up since the expression trees are smaller

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
HPCC-11515 Under-caching of dynamic filename resolution

Cache any dynamic file lookups until the end of the current graph.

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Merge pull request #6044 from richardkchapman/roxie-cache-dynamic

HPCC-11515 Under-caching of dynamic filename resolution

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>
Merge pull request #6042 from ghalliday/issue11605

HPCC-11605 Cherry pick fixes for IF() folding issues

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>
Merge branch 'closedown-4.2.x' into candidate-4.2.8

Conflicts:
	version.cmake

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Merge branch 'candidate-4.2.8' into closedown-4.2.x

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>