fix(sql): fix incorrect results returned when executing lower/upper/substring functions in parallel

[puzpuzpuz]

Queries with filters like UPPER(str_col) LIKE '%FOOBAR%' returned incorrect results when present in parallel filter or GROUP BY.

The list of affected SQL functions:

• upper/to_uppercase
• lower/to_lowercase
• substring
• base64
• quote_ident
• size_pretty
• concat

[ideoma]

[PR Coverage check]

😍 pass : 19 / 23 (82.61%)

file detail

	path	covered line	new line	coverage
🔵	io/questdb/griffin/engine/functions/str/QuoteIdentFunctionFactory.java	0	1	00.00%
🔵	io/questdb/griffin/engine/functions/bin/Base64FunctionFactory.java	3	5	60.00%
🔵	io/questdb/griffin/engine/functions/str/SizePrettyFunctionFactory.java	2	3	66.67%
🔵	io/questdb/griffin/engine/functions/str/ToUppercaseVarcharFunctionFactory.java	2	2	100.00%
🔵	io/questdb/griffin/engine/functions/str/LowerVarcharFunctionFactory.java	2	2	100.00%
🔵	io/questdb/griffin/engine/functions/str/ToLowercaseFunctionFactory.java	1	1	100.00%
🔵	io/questdb/griffin/engine/functions/str/ToLowercaseVarcharFunctionFactory.java	2	2	100.00%
🔵	io/questdb/griffin/engine/functions/str/ToUppercaseFunctionFactory.java	1	1	100.00%
🔵	io/questdb/griffin/engine/functions/str/ConcatFunctionFactory.java	1	1	100.00%
🔵	io/questdb/griffin/engine/functions/str/UpperVarcharFunctionFactory.java	2	2	100.00%
🔵	io/questdb/griffin/engine/functions/str/SubStringFunctionFactory.java	1	1	100.00%
🔵	io/questdb/griffin/engine/functions/str/SubStringVarcharFunctionFactory.java	2	2	100.00%