This should fix multi-threaded parsing. Not a clean solution, I am guessing the following block should be a single, state-less pattern? @mrks
```
\' { BEGIN singlequotedstring; strbuf = std::stringstream{}; }
<singlequotedstring>\'\' { strbuf << '\''; }
<singlequotedstring>[^']* { strbuf << yytext; }
<singlequotedstring>\' { BEGIN 0; yylval->sval = strdup(strbuf.str().c_str()); return SQL_STRING; }
<singlequotedstring><<EOF>> { fprintf(stderr, "[SQL-Lexer-Error] Unterminated string\n"); return 0; }
```
Anyway, the following hyrise playground does not crash anymore, so Toni should be able to work with this for the time being.
```c++
#include <iostream>
#include <thread>
#include "types.hpp"
#include "tpch/tpch_queries.hpp"
#include "SQLParser.h"
using namespace opossum; // NOLINT
int main() {
std::vector<std::thread> threads;
for (size_t t = 0; t < 200; ++t) {
threads.emplace_back([&]() {
for (size_t p = 0; p < 10'000; ++p) {
hsql::SQLParserResult result;
hsql::SQLParser::parse(tpch_queries.at(19), &result);
std::cout << "Parsing " << p << " is valid: " << result.isValid() << std::endl;
}
});
}
for (auto& thread : threads) {
thread.join();
}
return 0;
}
```
In addtion to already supported LIMIT/OFFSET variants allow more to be parsed
Legacy:
- LIMIT int
- LIMIT int OFFSET int
Enhancement:
- OFFSET int (no limit)
- LIMIT ALL (no limit)
- LIMIT NULL (no limit)
- LIMIT ALL OFFSET int (no limit, but offset)
- LIMIT NULL OFFSET int (no limit, but offset)
Also ensures negative limits / offsets are set to kNoLimit/kNoOffset
Consolidate LeftOuter/Left and RightOuter/Right as they are
by definition the same.
Similar consolidate FullOuter/Outer/Full ... with Outer (as in the
parser) not part of standard, but "full" missing. Allowing all three.
This commit potentially breaks other programs as kJoinLeftOuter and kJoinRightOuter
are eliminated
- allow multiple WHEN statements
- allow for syntax like `CASE x WHEN 1 THEN 2 WHEN 3 THEN 4 ELSE 5 END`
NOTE: This changes also the way the CASE operator is stored:
- CASE [expr] exprList [ELSE expr2] END
- exprList holds each of the WHEN statements with:
expr := WHEN, expr2 := THEN
Added also tests in test/select_tests.cpp
and adapted the existing one to reflect the new storage
d-justen
Julian Menzler
mrks
Leander Neiss
Moritz Eyssen
alkim0
Jan Koßmann
Tim Zimmermann
Falco Duersch
Markus Dreseler
javrucebo
Moritz Eyssen
Lawrence