[Fix](Variant) fix some nested explode_variant_array bug and add more…

… test (#44533)

be/src/vec/exprs/table_function/vexplode.cpp

@@ -24,20 +24,53 @@
 
 #include "common/status.h"
 #include "vec/columns/column.h"
+#include "vec/columns/column_array.h"
+#include "vec/columns/column_nothing.h"
 #include "vec/columns/column_object.h"
 #include "vec/common/string_ref.h"
 #include "vec/core/block.h"
 #include "vec/core/column_with_type_and_name.h"
 #include "vec/data_types/data_type.h"
+#include "vec/data_types/data_type_array.h"
+#include "vec/data_types/data_type_nothing.h"
 #include "vec/exprs/vexpr.h"
 #include "vec/exprs/vexpr_context.h"
+#include "vec/functions/function_helpers.h"
 
 namespace doris::vectorized {
 
 VExplodeTableFunction::VExplodeTableFunction() {
     _fn_name = "vexplode";
 }
 
+Status VExplodeTableFunction::_process_init_variant(Block* block, int value_column_idx) {
+    // explode variant array
+    const auto& variant_column = check_and_get_column<ColumnObject>(
+            remove_nullable(block->get_by_position(value_column_idx)
+                                    .column->convert_to_full_column_if_const())
+                    .get());
+    _detail.output_as_variant = true;
+    if (!variant_column->is_null_root()) {
+        _array_column = variant_column->get_root();
+        // We need to wrap the output nested column within a variant column.
+        // Otherwise the type is missmatched
+        const auto* array_type = check_and_get_data_type<DataTypeArray>(
+                remove_nullable(variant_column->get_root_type()).get());
+        if (array_type == nullptr) {
+            return Status::NotSupported("explode not support none array type {}",
+                                        variant_column->get_root_type()->get_name());
+        }
+        _detail.nested_type = array_type->get_nested_type();
+    } else {
+        // null root, use nothing type
+        _array_column = ColumnNullable::create(ColumnArray::create(ColumnNothing::create(0)),
+                                               ColumnUInt8::create(0));
+        _array_column->assume_mutable()->insert_many_defaults(variant_column->size());
+        _detail.nested_type = std::make_shared<DataTypeNothing>();
+    }
+    return Status::OK();
+}
+
 Status VExplodeTableFunction::process_init(Block* block, RuntimeState* state) {
     CHECK(_expr_context->root()->children().size() == 1)
             << "VExplodeTableFunction only support 1 child but has "
@@ -48,12 +81,7 @@ Status VExplodeTableFunction::process_init(Block* block, RuntimeState* state) {
                                                                   &value_column_idx));
     if (WhichDataType(remove_nullable(block->get_by_position(value_column_idx).type))
                 .is_variant_type()) {
-        // explode variant array
-        const auto& variant_column = check_and_get_column<ColumnObject>(
-                remove_nullable(block->get_by_position(value_column_idx)
-                                        .column->convert_to_full_column_if_const())
-                        .get());
-        _array_column = variant_column->get_root();
+        RETURN_IF_ERROR(_process_init_variant(block, value_column_idx));
     } else {
         _array_column =
                 block->get_by_position(value_column_idx).column->convert_to_full_column_if_const();

be/src/vec/exprs/table_function/vexplode.h

@@ -47,6 +47,7 @@ class VExplodeTableFunction : public TableFunction {
     int get_value(MutableColumnPtr& column, int max_step) override;
 
 private:
+    Status _process_init_variant(Block* block, int value_column_idx);
     ColumnPtr _array_column;
     ColumnArrayExecutionData _detail;
     size_t _array_offset; // start offset of array[row_idx]

be/src/vec/functions/array/function_array_distance.h

@@ -128,8 +128,8 @@ class FunctionArrayDistance : public IFunction {
 
         const auto& offsets1 = *arr1.offsets_ptr;
         const auto& offsets2 = *arr2.offsets_ptr;
-        const auto& nested_col1 = assert_cast<const ColumnFloat64*>(arr1.nested_col);
-        const auto& nested_col2 = assert_cast<const ColumnFloat64*>(arr2.nested_col);
+        const auto& nested_col1 = assert_cast<const ColumnFloat64*>(arr1.nested_col.get());
+        const auto& nested_col2 = assert_cast<const ColumnFloat64*>(arr2.nested_col.get());
         for (ssize_t row = 0; row < offsets1.size(); ++row) {
             if (arr1.array_nullmap_data && arr1.array_nullmap_data[row]) {
                 dst_null_data[row] = true;

be/src/vec/functions/array/function_array_utils.cpp

@@ -24,7 +24,9 @@
 
 #include "vec/columns/column.h"
 #include "vec/columns/column_nullable.h"
+#include "vec/columns/column_object.h"
 #include "vec/columns/column_vector.h"
+#include "vec/data_types/data_type.h"
 
 namespace doris::vectorized {
 
@@ -45,12 +47,19 @@ bool extract_column_array_info(const IColumn& src, ColumnArrayExecutionData& dat
 
     // extract array offsets and nested column
     data.offsets_ptr = &data.array_col->get_offsets();
-    data.nested_col = &data.array_col->get_data();
+    data.nested_col = data.array_col->get_data_ptr();
     // extract nested column is nullable
     if (data.nested_col->is_nullable()) {
         const auto& nested_null_col = reinterpret_cast<const ColumnNullable&>(*data.nested_col);
         data.nested_nullmap_data = nested_null_col.get_null_map_data().data();
-        data.nested_col = nested_null_col.get_nested_column_ptr().get();
+        data.nested_col = nested_null_col.get_nested_column_ptr();
+    }
+    if (data.output_as_variant &&
+        !WhichDataType(remove_nullable(data.nested_type)).is_variant_type()) {
+        // set variant root column/type to from column/type
+        auto variant = ColumnObject::create(true /*always nullable*/);
+        variant->create_root(data.nested_type, make_nullable(data.nested_col)->assume_mutable());
+        data.nested_col = variant->get_ptr();
     }
     return true;
 }

be/src/vec/functions/array/function_array_utils.h

@@ -16,6 +16,7 @@
 // under the License.
 #pragma once
 
+#include "vec/columns/column.h"
 #include "vec/columns/column_array.h"
 #include "vec/columns/column_nullable.h"
 #include "vec/columns/columns_number.h"
@@ -54,7 +55,10 @@ struct ColumnArrayExecutionData {
     const ColumnArray* array_col = nullptr;
     const ColumnArray::Offsets64* offsets_ptr = nullptr;
     const UInt8* nested_nullmap_data = nullptr;
-    const IColumn* nested_col = nullptr;
+    ColumnPtr nested_col = nullptr;
+    DataTypePtr nested_type = nullptr;
+    // wrap the nested column as variant column
+    bool output_as_variant = false;
 
     ColumnArrayMutableData to_mutable_data() const {
         ColumnArrayMutableData dst;

regression-test/data/variant_p0/nested.out

@@ -174,3 +174,23 @@ v.xx	tinyint	Yes	false	\N	NONE
 1	{"callLimit":3,"number":"02124713252","type":"HOME"}
 1	{"callLimit":5,"number":"5550219210","type":"GSM"}
 
+-- !sql --
+2	{"nested":[{"ba":"11111"},{"a":"1111"},{"axxxb":100,"xxxy111":111},{"aaa":"11","ddsss":1024},{"xx":10}]}
+4	{"nested":[{"baaa":"11111"},{"ax1111":"1111"},{"axxxb":100,"xxxy111":111},{"aaa":"11","ddsss":1024},{"xx":10}]}
+5	{"nested":[{"ba":"11111"},{"a":"1111"},{"axxxb":100,"xxxy111":111},{"aaa":"11","ddsss":1024},{"xx":10}]}
+6	{"nested":[{"mmm":"11111"},{"ax1111":"1111"},{"axxxb":100,"xxxy111":111},{"aaa":"11","ddsss":1024},{"xx":10}]}
+7	{"nested":[{"ba":"11111"},{"a":"1111"},{"axxxb":100,"xxxy111":111},{"aaa":"11","ddsss":1024},{"xx":10}]}
+8	{"nested":[{"yyy":"11111"},{"ax1111":"1111"},{"axxxb":100,"xxxy111":111},{"aaa":"11","ddsss":1024},{"xx":10}]}
+9	{"nested":[{"yyy":"11111"},{"ax1111":"1111"},{"axxxb":100,"xxxy111":111},{"aaa":"11","ddsss":1024},{"xx":10}]}
+11	{"nested":[{"yyy":"11111"},{"ax1111":"1111"},{"axxxb":100,"xxxy111":111},{"aaa":"11","ddsss":1024},{"xx":10}]}
+12	{"nested":[{"yyy":"11111"},{"ax1111":"1111"},{"axxxb":100,"xxxy111":111},{"aaa":"11","ddsss":1024},{"xx":10}]}
+13	{"nested":[{"yyy":"11111"},{"ax1111":"1111"},{"axxxb":100,"xxxy111":111},{"aaa":"11","ddsss":1024},{"xx":10}]}
+
+-- !explode_sql --
+
+-- !explode_sql --
+19	10
+
+-- !explode_sql --
+2	10
+

regression-test/suites/variant_p0/nested.groovy

@@ -162,13 +162,64 @@ suite("regression_test_variant_nested", "p0"){
         sql """insert into var_nested2 select * from var_nested order by k limit 1024"""
         qt_sql """select  /*+SET_VAR(batch_size=4064,broker_load_batch_size=16352,disable_streaming_preaggregations=true,enable_distinct_streaming_aggregation=true,parallel_fragment_exec_instance_num=5,parallel_pipeline_task_num=1,profile_level=1,enable_pipeline_engine=false,enable_parallel_scan=true,parallel_scan_max_scanners_count=48,parallel_scan_min_rows_per_scanner=16384,enable_fold_constant_by_be=true,enable_rewrite_element_at_to_slot=true,runtime_filter_type=12,enable_parallel_result_sink=false,enable_nereids_planner=true,rewrite_or_to_in_predicate_threshold=2,enable_function_pushdown=true,enable_common_expr_pushdown=false,enable_local_exchange=false,partitioned_hash_join_rows_threshold=1048576,partitioned_hash_agg_rows_threshold=8,partition_pruning_expand_threshold=10,enable_share_hash_table_for_broadcast_join=false,enable_two_phase_read_opt=true,enable_common_expr_pushdown_for_inverted_index=true,enable_delete_sub_predicate_v2=true,min_revocable_mem=33554432,fetch_remote_schema_timeout_seconds=120,max_fetch_remote_schema_tablet_count=512,enable_join_spill=false,enable_sort_spill=false,enable_agg_spill=false,enable_force_spill=false,data_queue_max_blocks=1,spill_streaming_agg_mem_limit=268435456,external_agg_partition_bits=5) */  * from var_nested2 order by k limit 10;"""
         qt_sql """select v['nested'] from var_nested2 where k < 10 order by k limit 10;"""
-        // explode variant array
+        // 0. nomal explode variant array
         order_qt_explode_sql """select count(),cast(vv['xx'] as int) from var_nested lateral view explode_variant_array(v['nested']) tmp as vv where vv['xx'] = 10 group by cast(vv['xx'] as int)"""
         sql """truncate table var_nested2"""
         sql """insert into var_nested2 values(1119111, '{"eventId":1,"firstName":"Name1","lastName":"Surname1","body":{"phoneNumbers":[{"number":"5550219210","type":"GSM","callLimit":5},{"number":"02124713252","type":"HOME","callLimit":3},{"number":"05550219211","callLimit":2,"type":"WORK"}]}}
 ')"""
         order_qt_explode_sql """select v['eventId'], phone_numbers from var_nested2 lateral view explode_variant_array(v['body']['phoneNumbers']) tmp1 as phone_numbers
 where phone_numbers['type'] = 'GSM' OR phone_numbers['type'] = 'HOME' and phone_numbers['callLimit'] > 2;"""
+
+        // test array_function
+        sql "DROP TABLE IF EXISTS var_nested_array_agg"
+        sql """
+                CREATE TABLE IF NOT EXISTS var_nested_array_agg(
+                    k bigint,
+                    v variant
+                )
+                UNIQUE KEY(`k`)
+                DISTRIBUTED BY HASH(k) BUCKETS 1
+                properties("replication_num" = "1", "disable_auto_compaction" = "false", "enable_unique_key_merge_on_write" = "true", "variant_enable_flatten_nested" = "true");
+            """
+        sql "insert into var_nested_array_agg select * from var_nested"
+        // 1. array_contains
+        qt_sql "select * from var_nested_array_agg where array_contains(cast(v['nested']['xx'] as array<int>), 10) order by k limit 10"
+        // 2. array_agg scalar
+        sql "select k, array_agg(cast(v['nested'] as text))  from var_nested_array_agg group by k limit 10"
+
+        // test explode_variant_array with abonomal case
+        sql "DROP TABLE IF EXISTS var_nested_explode_variant_with_abnomal"
+        sql """
+                CREATE TABLE IF NOT EXISTS var_nested_explode_variant_with_abnomal(
+                    k bigint,
+                    v variant
+                )
+                UNIQUE KEY(`k`)
+                DISTRIBUTED BY HASH(k) BUCKETS 1
+                properties("replication_num" = "1", "disable_auto_compaction" = "false", "enable_unique_key_merge_on_write" = "true", "variant_enable_flatten_nested" = "true");
+            """
+        sql "insert into var_nested_explode_variant_with_abnomal select * from var_nested"
+        // 1. v['nested']['x'] is null root
+        order_qt_explode_sql """select count(),cast(vv as int) from var_nested_explode_variant_with_abnomal lateral view explode_variant_array(v['nested']['x']) tmp as vv where vv = 10 group by cast(vv as int)"""
+        // 2. v['nested']['xx'] is normal array
+        order_qt_explode_sql """select count(),cast(vv as int) from var_nested_explode_variant_with_abnomal lateral view explode_variant_array(v['nested']['xx']) tmp as vv where vv = 10 group by cast(vv as int)"""
+        // 3. v['xx'] is none array scalar type 
+        test {
+            sql """select count(),cast(vv as int) from var_nested_explode_variant_with_abnomal lateral view explode_variant_array(v['xx']) tmp as vv where vv = 10 group by cast(vv as int)"""
+            exception("explode not support none array type")
+        }
+        // 4. v['k1'] is json scalar type 
+        test {
+            sql """select count(),cast(vv as int) from var_nested_explode_variant_with_abnomal lateral view explode_variant_array(v['k1']) tmp as vv where vv = 10 group by cast(vv as int)"""
+            exception("explode not support none array type")
+        }
+        // 5. toplevel nested array
+        sql "truncate table var_nested_explode_variant_with_abnomal"
+        sql """insert into var_nested_explode_variant_with_abnomal values(1, '[{"a" : 10}, {"b" : "20", "c" :1024, "a" : 11}]')"""
+        sql """insert into var_nested_explode_variant_with_abnomal values(2, '[{"a" : 10}, {"b" : "20", "a" : 150}]')"""
+        order_qt_explode_sql """select count(),cast(vv as int) from var_nested_explode_variant_with_abnomal lateral view explode_variant_array(v['a']) tmp as vv where vv = 10 group by cast(vv as int)"""
+        // FIXME after refator
+        // order_qt_explode_sql """select count(),cast(vv as int) from var_nested_explode_variant_with_abnomal lateral view explode_variant_array(v) tmp as vv where vv['a'] = 10 group by cast(vv as int)"""
     } finally {
         // reset flags
     }