HangyuanLiu commented on a change in pull request #4858:
URL: https://github.com/apache/incubator-doris/pull/4858#discussion_r521182314
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File path: be/src/exec/schema_scanner/schema_columns_scanner.cpp
##########
@@ -250,20 +265,33 @@ Status SchemaColumnsScanner::fill_one_row(Tuple *tuple,
MemPool *pool) {
memcpy(str_slot->ptr, buffer.c_str(), str_slot->len);
}
// CHARACTER_MAXIMUM_LENGTH
+ // For string columns, the maximum length in characters.
{
- tuple->set_null(_tuple_desc->slots()[8]->null_indicator_offset());
+ int data_type =
_desc_result.columns[_column_index].columnDesc.columnType;
+ if (data_type == TPrimitiveType::VARCHAR || data_type ==
TPrimitiveType::CHAR) {
+ void *slot =
tuple->get_slot(_tuple_desc->slots()[8]->tuple_offset());
+ int64_t* str_slot = reinterpret_cast<int64_t*>(slot);
+ if
(_desc_result.columns[_column_index].columnDesc.__isset.columnLength) {
+ *str_slot =
_desc_result.columns[_column_index].columnDesc.columnLength;
+ } else {
+
tuple->set_null(_tuple_desc->slots()[8]->null_indicator_offset());
+ }
+ } else {
+ tuple->set_null(_tuple_desc->slots()[8]->null_indicator_offset());
+ }
}
// CHARACTER_OCTET_LENGTH
+ // For string columns, the maximum length in bytes.
{
int data_type =
_desc_result.columns[_column_index].columnDesc.columnType;
if (data_type == TPrimitiveType::VARCHAR || data_type ==
TPrimitiveType::CHAR) {
void *slot =
tuple->get_slot(_tuple_desc->slots()[9]->tuple_offset());
int64_t* str_slot = reinterpret_cast<int64_t*>(slot);
if
(_desc_result.columns[_column_index].columnDesc.__isset.columnLength) {
- *str_slot =
_desc_result.columns[_column_index].columnDesc.columnLength;
+ *str_slot =
_desc_result.columns[_column_index].columnDesc.columnLength * 4;
Review comment:
For mysql-compatible purposes, we need to multiply this by 4.
According to
https://dev.mysql.com/doc/refman/8.0/en/information-schema-columns-table.html.
CHARACTER_OCTET_LENGTH stands for maximum length in **bytes**, while
CHARACTER_MAXIMUM_LENGTH stands for maximum length in **characters**
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