本文整理汇总了C++中Expression::compile方法的典型用法代码示例。如果您正苦于以下问题：C++ Expression::compile方法的具体用法？C++ Expression::compile怎么用？C++ Expression::compile使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类Expression的用法示例。
在下文中一共展示了Expression::compile方法的3个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1:
TEST(Expression, Run) {
Expression expression;
expression.compile("(10 + 20 + 1.1)");
Context context;
EXPECT_EQ(31.1, expression.run(context));
EXPECT_EQ(31.1, expression.run(context));
EXPECT_EQ(31.1, expression.run(context));
context["eur"] = 20.0;
expression.compile("(10 + eur + 1.1)");
EXPECT_EQ(31.1, expression.run(context));
context["eur"] = 21.0;
expression.compile("(10 + eur + 1.1)");
EXPECT_EQ(32.1, expression.run(context));
context.erase("eur");
expression.compile("(10 + eur + 1.1)");
EXPECT_EQ(11.1, expression.run(context));
expression.compile("average(1, 2) * 21 + 1.1");
EXPECT_EQ(32.6, expression.run(context));
expression.compile("1 + 2*3");
EXPECT_EQ(7, expression.run(context));
expression.compile("(1 + 2)*3");
EXPECT_EQ(9, expression.run(context));
expression.compile("(3 - 1) / 0.4");
EXPECT_EQ(5, expression.run(context));
}示例2: inferSchema
ArrayDesc inferSchema(std::vector< ArrayDesc> schemas, boost::shared_ptr< Query> query)
{
assert(schemas.size() == 1);
assert(_parameters[0]->getParamType() == PARAM_ATTRIBUTE_REF);
assert(_parameters[1]->getParamType() == PARAM_LOGICAL_EXPRESSION);
if ( _parameters.size() % 2 != 0 )
{
throw USER_EXCEPTION(SCIDB_SE_INFER_SCHEMA, SCIDB_LE_WRONG_OPERATOR_ARGUMENTS_COUNT2) << "tile_apply";
}
Attributes outAttrs;
AttributeID nextAttrId =0;
for (size_t i=0; i<schemas[0].getAttributes().size(); i++) {
AttributeDesc const& attr = schemas[0].getAttributes()[i];
if(attr.getType()!=TID_INDICATOR) {
outAttrs.push_back( AttributeDesc(nextAttrId++,
attr.getName(),
attr.getType(),
attr.getFlags(),
attr.getDefaultCompressionMethod(),
attr.getAliases(),
attr.getReserve(),
&attr.getDefaultValue(),
attr.getDefaultValueExpr(),
attr.getVarSize()));
}
}
size_t k;
for (k=0; k<_parameters.size(); k+=2) {
const string &attributeName = ((boost::shared_ptr<OperatorParamReference>&)_parameters[k])->getObjectName();
Expression expr;
expr.compile(((boost::shared_ptr<OperatorParamLogicalExpression>&)_parameters[k+1])->getExpression(),
query, _properties.tile, TID_VOID, schemas);
assert(!_properties.tile);
int flags = 0;
if (expr.isNullable()) {
flags = (int)AttributeDesc::IS_NULLABLE;
}
for (size_t j = 0; j < nextAttrId; j++) {
AttributeDesc const& attr = outAttrs[j];
if (attr.getName() == attributeName)
{
throw USER_EXCEPTION(SCIDB_SE_INFER_SCHEMA, SCIDB_LE_DUPLICATE_ATTRIBUTE_NAME) << attributeName;
}
}
outAttrs.push_back(AttributeDesc(nextAttrId++,
attributeName,
expr.getType(),
flags,
0));
}
if(schemas[0].getEmptyBitmapAttribute()) {
AttributeDesc const* emptyTag = schemas[0].getEmptyBitmapAttribute();
for (size_t j = 0; j < nextAttrId; j++) {
AttributeDesc const& attr = outAttrs[j];
if (attr.getName() == emptyTag->getName()) {
throw USER_EXCEPTION(SCIDB_SE_INFER_SCHEMA, SCIDB_LE_DUPLICATE_ATTRIBUTE_NAME) << attr.getName();
}
}
outAttrs.push_back( AttributeDesc(nextAttrId,
emptyTag->getName(),
emptyTag->getType(),
emptyTag->getFlags(),
emptyTag->getDefaultCompressionMethod(),
emptyTag->getAliases(),
emptyTag->getReserve(),
&emptyTag->getDefaultValue(),
emptyTag->getDefaultValueExpr(),
emptyTag->getVarSize()));
}
return ArrayDesc(schemas[0].getName(), outAttrs, schemas[0].getDimensions());
}示例3: execute
shared_ptr< Array > execute(vector< shared_ptr< Array> >& inputArrays, shared_ptr<Query> query)
{
// I maintain the log of the operator in a local file named after Correlation_N.log, N is the instance ID.
stringstream logFileName;
logFileName << "/home/scidb/preselect_" << query->getInstanceID() << ".log";
FILE *logFile;
logFile = fopen(logFileName.str().c_str(), "w");
shared_ptr<Array> originalArray = inputArrays[0];
shared_ptr<Array> correlationArray = inputArrays[1];
ArrayDesc originalSchema = originalArray->getArrayDesc();
ArrayDesc corrSchema = correlationArray->getArrayDesc();
Dimensions originalDims = originalSchema.getDimensions();
Dimensions corrDims = corrSchema.getDimensions();
DimensionDesc originalDimsP = originalDims[1];
DimensionDesc corrDimsP = corrDims[0];
// Note the correlation array doesn't have Y column.
Coordinate p = corrDimsP.getCurrLength();
fprintf(logFile, "p = %ld\n # of chunk = %ld\n", p, corrSchema.getNumberOfChunks());
fflush(logFile);
shared_ptr<ConstArrayIterator> corrArrayIter = correlationArray->getIterator(0);
if(! corrArrayIter->end() )
{
correlation *corr = new correlation[p];
// The correlation array will always have only 1 chunk (we designed correlation array like this), so no loops here.
shared_ptr<ConstChunkIterator> corrChunkIter = corrArrayIter->getChunk().getConstIterator();
for(Coordinate i=0; i<p; ++i)
{
corr[i].id = i+1;
corr[i].corr = corrChunkIter->getItem().getDouble();
//fprintf(logFile, "%d, %f\n", corr[i].id, corr[i].corr);
++(*corrChunkIter);
}
//fflush(logFile);
qsort(corr, p, sizeof(correlation), &comp);
for(Coordinate i=0; i<p; ++i)
{
fprintf(logFile, "%d, %f\n", corr[i].id, corr[i].corr);
}
fflush(logFile);
Coordinate d = ((boost::shared_ptr<OperatorParamPhysicalExpression>&)_parameters[0])->getExpression()->evaluate().getInt64();
fprintf(logFile, "d=%ld\n", d);
stringstream ss;
vector<string> names;
names.push_back("j");
vector<TypeId> types;
types.push_back(TID_INT64);
for(Coordinate i=0; i<d; ++i)
{
ss << "j=" << corr[i].id << " or ";
}
ss << "j=" << p+1;
fprintf(logFile, "%s\n", ss.str().c_str());
fflush(logFile);
Expression e;
e.compile(ss.str(), names, types);
fclose(logFile);
boost::shared_ptr<scidb::Query> emptyQuery;
return boost::shared_ptr<Array>(new FilterArray(_schema, inputArrays[0], boost::make_shared<Expression>(e), emptyQuery, _tileMode));
}
else
{
shared_ptr<Array> outputArray(new MemArray(_schema, query));
fclose(logFile);
return outputArray;
}
}