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#include <Interpreters/ConvertStringsToEnumVisitor.h>
#include <Parsers/ASTFunction.h>
#include <Parsers/ASTLiteral.h>
#include <Parsers/IAST.h>
#include <Common/typeid_cast.h>
namespace DB
{
namespace
{
/// @note We place strings in ascending order here under the assumption it colud speed up String to Enum conversion.
String makeStringsEnum(const std::set<String> & values)
{
String enum_string = "Enum8(";
if (values.size() >= 255)
enum_string = "Enum16(";
size_t number = 1;
for (const auto & item : values)
{
enum_string += "\'" + item + "\' = " + std::to_string(number++);
if (number <= values.size())
enum_string += ", ";
}
enum_string += ")";
return enum_string;
}
void changeIfArguments(ASTPtr & first, ASTPtr & second)
{
String first_value = first->as<ASTLiteral>()->value.get<String>();
String second_value = second->as<ASTLiteral>()->value.get<String>();
std::set<String> values;
values.insert(first_value);
values.insert(second_value);
String enum_string = makeStringsEnum(values);
auto enum_literal = std::make_shared<ASTLiteral>(enum_string);
auto first_cast = makeASTFunction("_CAST");
first_cast->arguments->children.push_back(first);
first_cast->arguments->children.push_back(enum_literal);
auto second_cast = makeASTFunction("_CAST");
second_cast->arguments->children.push_back(second);
second_cast->arguments->children.push_back(enum_literal);
first = first_cast;
second = second_cast;
}
void changeTransformArguments(ASTPtr & array_to, ASTPtr & other)
{
std::set<String> values;
for (const auto & item : array_to->as<ASTLiteral>()->value.get<Array>())
values.insert(item.get<String>());
values.insert(other->as<ASTLiteral>()->value.get<String>());
String enum_string = makeStringsEnum(values);
auto array_cast = makeASTFunction("_CAST");
array_cast->arguments->children.push_back(array_to);
array_cast->arguments->children.push_back(std::make_shared<ASTLiteral>("Array(" + enum_string + ")"));
array_to = array_cast;
auto other_cast = makeASTFunction("_CAST");
other_cast->arguments->children.push_back(other);
other_cast->arguments->children.push_back(std::make_shared<ASTLiteral>(enum_string));
other = other_cast;
}
bool checkSameType(const Array & array, const String & type)
{
for (const auto & item : array)
if (item.getTypeName() != type)
return false;
return true;
}
}
bool FindUsedFunctionsMatcher::needChildVisit(const ASTPtr & node, const ASTPtr &)
{
return !(node->as<ASTFunction>());
}
void FindUsedFunctionsMatcher::visit(const ASTPtr & ast, Data & data)
{
if (auto * func = ast->as<ASTFunction>())
visit(*func, data);
}
void FindUsedFunctionsMatcher::visit(const ASTFunction & func, Data & data)
{
if (data.names.contains(func.name) && !data.call_stack.empty())
{
String alias = func.tryGetAlias();
if (!alias.empty())
{
data.used_functions.insert(alias);
}
}
data.call_stack.push_back(func.name);
/// Visit children with known call stack
Visitor(data).visit(func.arguments);
data.call_stack.pop_back();
}
bool ConvertStringsToEnumMatcher::needChildVisit(const ASTPtr & node, const ASTPtr &)
{
return !(node->as<ASTFunction>());
}
void ConvertStringsToEnumMatcher::visit(ASTPtr & ast, Data & data)
{
if (auto * func = ast->as<ASTFunction>())
visit(*func, data);
}
void ConvertStringsToEnumMatcher::visit(ASTFunction & function_node, Data & data)
{
if (!function_node.arguments)
return;
/// We are not sure we could change the type of function result
/// cause it is present in other function as argument
if (data.used_functions.contains(function_node.tryGetAlias()))
return;
if (function_node.name == "if")
{
if (function_node.arguments->children.size() != 3)
return;
const ASTLiteral * literal1 = function_node.arguments->children[1]->as<ASTLiteral>();
const ASTLiteral * literal2 = function_node.arguments->children[2]->as<ASTLiteral>();
if (!literal1 || !literal2)
return;
if (literal1->value.getTypeName() != "String" || literal2->value.getTypeName() != "String")
return;
changeIfArguments(function_node.arguments->children[1],
function_node.arguments->children[2]);
}
else if (function_node.name == "transform")
{
if (function_node.arguments->children.size() != 4)
return;
const ASTLiteral * literal_to = function_node.arguments->children[2]->as<ASTLiteral>();
const ASTLiteral * literal_other = function_node.arguments->children[3]->as<ASTLiteral>();
if (!literal_to || !literal_other)
return;
if (literal_to->value.getTypeName() != "Array" || literal_other->value.getTypeName() != "String")
return;
Array array_to = literal_to->value.get<Array>();
if (array_to.empty())
return;
bool to_strings = checkSameType(array_to, "String");
if (!to_strings)
return;
changeTransformArguments(function_node.arguments->children[2], function_node.arguments->children[3]);
}
}
}
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