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fix conversion error while getting psql table structure for empty array

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This commit is contained in:
Mike Kot 2023-12-07 13:38:32 +00:00
parent 8f32293104
commit 4ef9065567
1 changed files with 3 additions and 1 deletions
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4
src/Databases/PostgreSQL/fetchPostgreSQLTableStructure.cpp
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@ -216,7 +216,9 @@ PostgreSQLTableStructure::ColumnsInfoPtr readNamesAndTypesList(
/// All rows must contain the same number of dimensions, so limit 1 is ok. If number of dimensions in all rows is not the same -
/// such arrays are not able to be used as ClickHouse Array at all.
pqxx::result result{tx.exec(fmt::format("SELECT array_ndims({}) FROM {} LIMIT 1", name_and_type.name, postgres_table))};
auto dimensions = result[0][0].as<int>();
// array_ndims() may return null for empty array, but we expect 0:
// https://github.com/postgres/postgres/blob/d16a0c1e2e3874cd5adfa9ee968008b6c4b1ae01/src/backend/utils/adt/arrayfuncs.c#L1658
auto dimensions = result[0][0].as<std::optional<int>>().value_or(0);
/// It is always 1d array if it is in recheck.
DataTypePtr type = assert_cast<const DataTypeArray *>(name_and_type.type.get())->getNestedType();