std::string
TableCatalogDelegate::getIndexIdString(const catalog::Index &catalogIndex)
{
vector<int32_t> columnIndexes(catalogIndex.columns().size());
// get the list of column indexes in the target table
// in the order they appear in the index
map<string, catalog::ColumnRef*>::const_iterator col_iterator;
for (col_iterator = catalogIndex.columns().begin();
col_iterator != catalogIndex.columns().end();
col_iterator++)
{
int32_t index = col_iterator->second->index();
const catalog::Column *catalogColumn = col_iterator->second->column();
columnIndexes[index] = catalogColumn->index();
}
const std::string expressionsAsText = catalogIndex.expressionsjson();
return getIndexIdFromMap((TableIndexType)catalogIndex.type(),
true, //catalogIndex.countable(), // always counting for now
catalogIndex.unique(),
expressionsAsText,
columnIndexes);
}
bool TableCatalogDelegate::getIndexScheme(catalog::Table const &catalogTable,
catalog::Index const &catalogIndex,
const TupleSchema *schema,
TableIndexScheme *scheme)
{
vector<int> index_columns;
vector<ValueType> column_types;
// The catalog::Index object now has a list of columns that are to be
// used
if (catalogIndex.columns().size() == (size_t)0) {
VOLT_ERROR("Index '%s' in table '%s' does not declare any columns"
" to use",
catalogIndex.name().c_str(),
catalogTable.name().c_str());
return false;
}
vector<AbstractExpression*> indexedExpressions = TableIndex::simplyIndexColumns();
const std::string expressionsAsText = catalogIndex.expressionsjson();
if (expressionsAsText.length() != 0) {
ExpressionUtil::loadIndexedExprsFromJson(indexedExpressions, expressionsAsText);
}
// Since the columns are not going to come back in the proper order from
// the catalogs, we'll use the index attribute to make sure we put them
// in the right order
index_columns.resize(catalogIndex.columns().size());
map<string, catalog::ColumnRef*>::const_iterator colref_iterator;
for (colref_iterator = catalogIndex.columns().begin();
colref_iterator != catalogIndex.columns().end();
colref_iterator++) {
catalog::ColumnRef *catalog_colref = colref_iterator->second;
if (catalog_colref->index() < 0) {
VOLT_ERROR("Invalid column '%d' for index '%s' in table '%s'",
catalog_colref->index(),
catalogIndex.name().c_str(),
catalogTable.name().c_str());
return false;
}
index_columns[catalog_colref->index()] = catalog_colref->column()->index();
}
// partial index predicate
const std::string predicateAsText = catalogIndex.predicatejson();
AbstractExpression* predicate = NULL;
if (!predicateAsText.empty()) {
predicate = ExpressionUtil::loadExpressionFromJson(predicateAsText);
}
*scheme = TableIndexScheme(catalogIndex.name(),
(TableIndexType)catalogIndex.type(),
index_columns,
indexedExpressions,
predicate,
catalogIndex.unique(),
catalogIndex.countable(),
expressionsAsText,
predicateAsText,
schema);
return true;
}