- Support like operator with signature:

expr1 LIKE expr2 [ESCAPE expr3]

which returns TRUE only if expr1 matches the
string specified by expr2 (pattern). '_' in
pattern matches any single character, '%'
matches any character 0 or more times. All
other characters match itself according to
case.

- Optional escape clause specifies character
to use for escaping '_' and '%'

- to_params uses subtree iterator to create
parameters for cached query. But our plan
is a DAG, not a tree. We have multiple nodes
referring to the same node, this leads to
situation when we traverse the same subquery
node multiple times. This in term leads to
wrong number of parameters produces by
to_params
- fix this by keeping track of already traversed
parameter nodes in to_params

feat: support additional SubQuery children for any relational operator, interpret SubQuery with single output as expression

Co-authored-by: Georgy Moshkin <gmoshkin@picodata.io>

Kurdakov Alexander authored 6 months ago and Alexander Kurdakov committed 6 months ago

Previously some public lua functions in core-router.lua failed
returning nil instead of an error. As a result in a case of error
rust code treated it as success, but failed to pop expected results
from lua stack. So, instead of a real error user got lua reading
errors. Fixed.

Co-authored-by: Denis Smirnov <sd@picodata.io>

feat: add logic of correct local SQL generation for the case of asterisk (not in a view of references, but as "*")

fix: remove useless SubQuery nodes, fix logic of vtable columns naming (automatic indexes instead of names from local SQL metadata)