You are viewing a plain text version of this content. The canonical link for it is here.
Posted to commits@datafusion.apache.org by gi...@apache.org on 2026/04/27 17:09:59 UTC
(datafusion) branch gh-readonly-queue/main/pr-21725-62ad66beb1e13490980dc5e53e5542f6f07cce65 created (now 40b209ee67)
This is an automated email from the ASF dual-hosted git repository.
github-merge-queue[bot] pushed a change to branch gh-readonly-queue/main/pr-21725-62ad66beb1e13490980dc5e53e5542f6f07cce65
in repository https://gitbox.apache.org/repos/asf/datafusion.git
at 40b209ee67 feat: remove `__unnest_placeholder` from struct unnest projection (#21725)
This branch includes the following new commits:
new 40b209ee67 feat: remove `__unnest_placeholder` from struct unnest projection (#21725)
The 1 revisions listed above as "new" are entirely new to this
repository and will be described in separate emails. The revisions
listed as "add" were already present in the repository and have only
been added to this reference.
---------------------------------------------------------------------
To unsubscribe, e-mail: commits-unsubscribe@datafusion.apache.org
For additional commands, e-mail: commits-help@datafusion.apache.org
(datafusion) 01/01: feat: remove `__unnest_placeholder` from struct unnest projection (#21725)
Posted by gi...@apache.org.
This is an automated email from the ASF dual-hosted git repository.
github-merge-queue[bot] pushed a commit to branch gh-readonly-queue/main/pr-21725-62ad66beb1e13490980dc5e53e5542f6f07cce65
in repository https://gitbox.apache.org/repos/asf/datafusion.git
commit 40b209ee6700723d1179e98b5862b7e5a7e2b6a5
Author: Andrey Koshchiy <an...@gmail.com>
AuthorDate: Mon Apr 27 20:09:36 2026 +0300
feat: remove `__unnest_placeholder` from struct unnest projection (#21725)
## Which issue does this PR close?
<!--
We generally require a GitHub issue to be filed for all bug fixes and
enhancements and this helps us generate change logs for our releases.
You can link an issue to this PR using the GitHub syntax. For example
`Closes #123` indicates that this PR will close issue #123.
-->
- Closes #16894
## What changes are included in this PR?
- User-visible struct-UNNEST columns no longer expose
`__unnest_placeholder`.
- Internal Unnest planning still uses placeholders.
- This adds a final Projection layer in explain plans wherever struct
UNNEST output is published.
<!--
There is no need to duplicate the description in the issue here but it
is sometimes worth providing a summary of the individual changes in this
PR.
-->
## Are these changes tested?
Yes.
<!--
We typically require tests for all PRs in order to:
1. Prevent the code from being accidentally broken by subsequent changes
2. Serve as another way to document the expected behavior of the code
If tests are not included in your PR, please explain why (for example,
are they covered by existing tests)?
-->
## Are there any user-facing changes?
Yes. The aliases of unnested columns will be changed.
<!--
If there are user-facing changes then we may require documentation to be
updated before approving the PR.
-->
<!--
If there are any breaking changes to public APIs, please add the `api
change` label.
-->
---------
Co-authored-by: Andrew Lamb <an...@nerdnetworks.org>
---
datafusion/sql/src/select.rs | 68 ++++++++++++++++++----
datafusion/sql/tests/cases/plan_to_sql.rs | 2 +-
.../test_files/push_down_filter_unnest.slt | 15 ++---
datafusion/sqllogictest/test_files/unnest.slt | 68 ++++++++++++----------
docs/source/user-guide/sql/special_functions.md | 4 +-
5 files changed, 106 insertions(+), 51 deletions(-)
diff --git a/datafusion/sql/src/select.rs b/datafusion/sql/src/select.rs
index 82cca91d4e..09d8566c4a 100644
--- a/datafusion/sql/src/select.rs
+++ b/datafusion/sql/src/select.rs
@@ -24,13 +24,17 @@ use crate::query::to_order_by_exprs_with_select;
use crate::utils::{
CheckColumnsMustReferenceAggregatePurpose, CheckColumnsSatisfyExprsPurpose,
check_columns_satisfy_exprs, extract_aliases, rebase_expr, resolve_aliases_to_exprs,
- resolve_columns, resolve_positions_to_exprs, rewrite_recursive_unnests_bottom_up,
+ resolve_columns, resolve_positions_to_exprs, rewrite_recursive_unnest_bottom_up,
+ rewrite_recursive_unnests_bottom_up,
};
+use arrow::datatypes::DataType;
use datafusion_common::error::DataFusionErrorBuilder;
use datafusion_common::tree_node::{TreeNode, TreeNodeRecursion};
use datafusion_common::{Column, DFSchema, DFSchemaRef, Result, not_impl_err, plan_err};
use datafusion_common::{RecursionUnnestOption, UnnestOptions};
+use datafusion_expr::ExprSchemable;
+use datafusion_expr::builder::get_struct_unnested_columns;
use datafusion_expr::expr::{PlannedReplaceSelectItem, WildcardOptions};
use datafusion_expr::expr_rewriter::{
normalize_col, normalize_col_with_schemas_and_ambiguity_check, normalize_sorts,
@@ -463,15 +467,30 @@ impl<S: ContextProvider> SqlToRel<'_, S> {
// expr returned here maybe different from the originals in inner_projection_exprs
// for example:
- // - unnest(struct_col) will be transformed into unnest(struct_col).field1, unnest(struct_col).field2
- // - unnest(array_col) will be transformed into unnest(array_col).element
- // - unnest(array_col) + 1 will be transformed into unnest(array_col).element +1
- let outer_projection_exprs = rewrite_recursive_unnests_bottom_up(
- &intermediate_plan,
- &mut unnest_columns,
- &mut inner_projection_exprs,
- &intermediate_select_exprs,
- )?;
+ // - unnest(struct_col) will be transformed into struct_col.field1, struct_col.field2
+ // - unnest(array_col) will be transformed into array_col.element
+ // - unnest(array_col) + 1 will be transformed into array_col.element +1
+ let mut outer_projection_exprs = vec![];
+ for expr in &intermediate_select_exprs {
+ let mut rewritten_exprs = rewrite_recursive_unnest_bottom_up(
+ &intermediate_plan,
+ &mut unnest_columns,
+ &mut inner_projection_exprs,
+ expr,
+ )?;
+
+ if let Some(columns) =
+ self.get_struct_unnest_columns(&intermediate_plan, expr)?
+ {
+ rewritten_exprs = rewritten_exprs
+ .into_iter()
+ .zip(columns)
+ .map(|(expr, column)| expr.alias(column.flat_name()))
+ .collect();
+ }
+
+ outer_projection_exprs.extend(rewritten_exprs);
+ }
// No more unnest is possible
if unnest_columns.is_empty() {
@@ -516,6 +535,35 @@ impl<S: ContextProvider> SqlToRel<'_, S> {
.build()
}
+ fn get_struct_unnest_columns(
+ &self,
+ input: &LogicalPlan,
+ expr: &Expr,
+ ) -> Result<Option<Vec<Column>>> {
+ let unnest_expr = match expr {
+ Expr::Unnest(unnest_expr) => Some(unnest_expr),
+ Expr::Alias(alias) => match alias.expr.as_ref() {
+ Expr::Unnest(unnest_expr) => Some(unnest_expr),
+ _ => None,
+ },
+ _ => None,
+ };
+
+ let Some(unnest_expr) = unnest_expr else {
+ return Ok(None);
+ };
+
+ let field = unnest_expr.expr.to_field(input.schema())?.1;
+ let DataType::Struct(inner_fields) = field.data_type() else {
+ return Ok(None);
+ };
+
+ Ok(Some(get_struct_unnested_columns(
+ &unnest_expr.expr.schema_name().to_string(),
+ inner_fields,
+ )))
+ }
+
fn try_process_aggregate_unnest(&self, input: LogicalPlan) -> Result<LogicalPlan> {
match input {
// Fast path if there are no unnest in group by
diff --git a/datafusion/sql/tests/cases/plan_to_sql.rs b/datafusion/sql/tests/cases/plan_to_sql.rs
index 88c60c8c7b..67e67dafba 100644
--- a/datafusion/sql/tests/cases/plan_to_sql.rs
+++ b/datafusion/sql/tests/cases/plan_to_sql.rs
@@ -988,7 +988,7 @@ fn test_unnest_logical_plan() -> Result<()> {
assert_snapshot!(
plan,
@r"
- Projection: __unnest_placeholder(unnest_table.struct_col).field1, __unnest_placeholder(unnest_table.struct_col).field2, __unnest_placeholder(unnest_table.array_col,depth=1) AS UNNEST(unnest_table.array_col), unnest_table.struct_col, unnest_table.array_col
+ Projection: __unnest_placeholder(unnest_table.struct_col).field1 AS unnest_table.struct_col.field1, __unnest_placeholder(unnest_table.struct_col).field2 AS unnest_table.struct_col.field2, __unnest_placeholder(unnest_table.array_col,depth=1) AS UNNEST(unnest_table.array_col), unnest_table.struct_col, unnest_table.array_col
Unnest: lists[__unnest_placeholder(unnest_table.array_col)|depth=1] structs[__unnest_placeholder(unnest_table.struct_col)]
Projection: unnest_table.struct_col AS __unnest_placeholder(unnest_table.struct_col), unnest_table.array_col AS __unnest_placeholder(unnest_table.array_col), unnest_table.struct_col, unnest_table.array_col
TableScan: unnest_table
diff --git a/datafusion/sqllogictest/test_files/push_down_filter_unnest.slt b/datafusion/sqllogictest/test_files/push_down_filter_unnest.slt
index 704ad326cc..1921fbfb43 100644
--- a/datafusion/sqllogictest/test_files/push_down_filter_unnest.slt
+++ b/datafusion/sqllogictest/test_files/push_down_filter_unnest.slt
@@ -130,19 +130,20 @@ statement ok
CREATE TABLE d AS VALUES (named_struct('a', 1, 'b', 2)), (named_struct('a', 3, 'b', 4)), (named_struct('a', 5, 'b', 6));
query II
-select * from (select unnest(column1) from d) where "__unnest_placeholder(d.column1).b" > 5;
+select * from (select unnest(column1) from d) where "d.column1.b" > 5;
----
5 6
query TT
-explain select * from (select unnest(column1) from d) where "__unnest_placeholder(d.column1).b" > 5;
+explain select * from (select unnest(column1) from d) where "d.column1.b" > 5;
----
physical_plan
-01)FilterExec: __unnest_placeholder(d.column1).b@1 > 5
-02)--RepartitionExec: partitioning=RoundRobinBatch(4), input_partitions=1
-03)----UnnestExec
-04)------ProjectionExec: expr=[column1@0 as __unnest_placeholder(d.column1)]
-05)--------DataSourceExec: partitions=1, partition_sizes=[1]
+01)ProjectionExec: expr=[__unnest_placeholder(d.column1).a@0 as d.column1.a, __unnest_placeholder(d.column1).b@1 as d.column1.b]
+02)--FilterExec: __unnest_placeholder(d.column1).b@1 > 5
+03)----RepartitionExec: partitioning=RoundRobinBatch(4), input_partitions=1
+04)------UnnestExec
+05)--------ProjectionExec: expr=[column1@0 as __unnest_placeholder(d.column1)]
+06)----------DataSourceExec: partitions=1, partition_sizes=[1]
statement ok
drop table d;
diff --git a/datafusion/sqllogictest/test_files/unnest.slt b/datafusion/sqllogictest/test_files/unnest.slt
index 8cfc01380d..ac01b7d1f7 100644
--- a/datafusion/sqllogictest/test_files/unnest.slt
+++ b/datafusion/sqllogictest/test_files/unnest.slt
@@ -68,9 +68,9 @@ select unnest(struct(1,2,3)) as ignored_alias;
query TTT
describe select unnest(struct(1,2,3)) as ignored_alias;
----
-__unnest_placeholder(struct(Int64(1),Int64(2),Int64(3))).c0 Int64 YES
-__unnest_placeholder(struct(Int64(1),Int64(2),Int64(3))).c1 Int64 YES
-__unnest_placeholder(struct(Int64(1),Int64(2),Int64(3))).c2 Int64 YES
+struct(Int64(1),Int64(2),Int64(3)).c0 Int64 YES
+struct(Int64(1),Int64(2),Int64(3)).c1 Int64 YES
+struct(Int64(1),Int64(2),Int64(3)).c2 Int64 YES
## Basic unnest list expression in from clause
query I
@@ -608,18 +608,20 @@ query TT
explain select unnest(unnest(column3)), column3 from recursive_unnest_table;
----
logical_plan
-01)Unnest: lists[] structs[__unnest_placeholder(UNNEST(recursive_unnest_table.column3))]
-02)--Projection: __unnest_placeholder(recursive_unnest_table.column3,depth=1) AS UNNEST(recursive_unnest_table.column3) AS __unnest_placeholder(UNNEST(recursive_unnest_table.column3)), recursive_unnest_table.column3
-03)----Unnest: lists[__unnest_placeholder(recursive_unnest_table.column3)|depth=1] structs[]
-04)------Projection: recursive_unnest_table.column3 AS __unnest_placeholder(recursive_unnest_table.column3), recursive_unnest_table.column3
-05)--------TableScan: recursive_unnest_table projection=[column3]
+01)Projection: __unnest_placeholder(UNNEST(recursive_unnest_table.column3)).c0 AS UNNEST(recursive_unnest_table.column3).c0, __unnest_placeholder(UNNEST(recursive_unnest_table.column3)).c1 AS UNNEST(recursive_unnest_table.column3).c1, recursive_unnest_table.column3
+02)--Unnest: lists[] structs[__unnest_placeholder(UNNEST(recursive_unnest_table.column3))]
+03)----Projection: __unnest_placeholder(recursive_unnest_table.column3,depth=1) AS UNNEST(recursive_unnest_table.column3) AS __unnest_placeholder(UNNEST(recursive_unnest_table.column3)), recursive_unnest_table.column3
+04)------Unnest: lists[__unnest_placeholder(recursive_unnest_table.column3)|depth=1] structs[]
+05)--------Projection: recursive_unnest_table.column3 AS __unnest_placeholder(recursive_unnest_table.column3), recursive_unnest_table.column3
+06)----------TableScan: recursive_unnest_table projection=[column3]
physical_plan
-01)UnnestExec
-02)--RepartitionExec: partitioning=RoundRobinBatch(4), input_partitions=1
-03)----ProjectionExec: expr=[__unnest_placeholder(recursive_unnest_table.column3,depth=1)@0 as __unnest_placeholder(UNNEST(recursive_unnest_table.column3)), column3@1 as column3]
-04)------UnnestExec
-05)--------ProjectionExec: expr=[column3@0 as __unnest_placeholder(recursive_unnest_table.column3), column3@0 as column3]
-06)----------DataSourceExec: partitions=1, partition_sizes=[1]
+01)ProjectionExec: expr=[__unnest_placeholder(UNNEST(recursive_unnest_table.column3)).c0@0 as UNNEST(recursive_unnest_table.column3).c0, __unnest_placeholder(UNNEST(recursive_unnest_table.column3)).c1@1 as UNNEST(recursive_unnest_table.column3).c1, column3@2 as column3]
+02)--UnnestExec
+03)----RepartitionExec: partitioning=RoundRobinBatch(4), input_partitions=1
+04)------ProjectionExec: expr=[__unnest_placeholder(recursive_unnest_table.column3,depth=1)@0 as __unnest_placeholder(UNNEST(recursive_unnest_table.column3)), column3@1 as column3]
+05)--------UnnestExec
+06)----------ProjectionExec: expr=[column3@0 as __unnest_placeholder(recursive_unnest_table.column3), column3@0 as column3]
+07)------------DataSourceExec: partitions=1, partition_sizes=[1]
## unnest->field_access->unnest->unnest
query I?
@@ -824,9 +826,9 @@ d e {c0: f}
query TTT
describe select unnest(column1) c1 from nested_unnest_table;
----
-__unnest_placeholder(nested_unnest_table.column1).c0 Utf8 YES
-__unnest_placeholder(nested_unnest_table.column1).c1 Utf8 YES
-__unnest_placeholder(nested_unnest_table.column1).c2 Struct("c0": Utf8) YES
+nested_unnest_table.column1.c0 Utf8 YES
+nested_unnest_table.column1.c1 Utf8 YES
+nested_unnest_table.column1.c2 Struct("c0": Utf8) YES
query II??I??
select unnest(column5), * from unnest_table;
@@ -1098,15 +1100,17 @@ EXPLAIN WITH unnested AS (
) SELECT * FROM unnested order by 1;
----
logical_plan
-01)Sort: unnested.__unnest_placeholder(struct(t.column1,t.column2,t.column3)).c0 ASC NULLS LAST
+01)Sort: unnested.struct(t.column1,t.column2,t.column3).c0 ASC NULLS LAST
02)--SubqueryAlias: unnested
-03)----Unnest: lists[] structs[__unnest_placeholder(struct(t.column1,t.column2,t.column3))]
-04)------Projection: struct(t.column1, t.column2, t.column3) AS __unnest_placeholder(struct(t.column1,t.column2,t.column3))
-05)--------TableScan: t projection=[column1, column2, column3]
+03)----Projection: __unnest_placeholder(struct(t.column1,t.column2,t.column3)).c0 AS struct(t.column1,t.column2,t.column3).c0, __unnest_placeholder(struct(t.column1,t.column2,t.column3)).c1 AS struct(t.column1,t.column2,t.column3).c1, __unnest_placeholder(struct(t.column1,t.column2,t.column3)).c2 AS struct(t.column1,t.column2,t.column3).c2
+04)------Unnest: lists[] structs[__unnest_placeholder(struct(t.column1,t.column2,t.column3))]
+05)--------Projection: struct(t.column1, t.column2, t.column3) AS __unnest_placeholder(struct(t.column1,t.column2,t.column3))
+06)----------TableScan: t projection=[column1, column2, column3]
physical_plan
-01)SortExec: expr=[__unnest_placeholder(struct(t.column1,t.column2,t.column3)).c0@0 ASC NULLS LAST], preserve_partitioning=[false]
-02)--UnnestExec
-03)----DataSourceExec: file_groups={1 group: [[WORKSPACE_ROOT/datafusion/sqllogictest/test_files/scratch/unnest/ordered_tuples.parquet]]}, projection=[struct(column1@0, column2@1, column3@2) as __unnest_placeholder(struct(t.column1,t.column2,t.column3))], file_type=parquet
+01)SortExec: expr=[struct(t.column1,t.column2,t.column3).c0@0 ASC NULLS LAST], preserve_partitioning=[false]
+02)--ProjectionExec: expr=[__unnest_placeholder(struct(t.column1,t.column2,t.column3)).c0@0 as struct(t.column1,t.column2,t.column3).c0, __unnest_placeholder(struct(t.column1,t.column2,t.column3)).c1@1 as struct(t.column1,t.column2,t.column3).c1, __unnest_placeholder(struct(t.column1,t.column2,t.column3)).c2@2 as struct(t.column1,t.column2,t.column3).c2]
+03)----UnnestExec
+04)------DataSourceExec: file_groups={1 group: [[WORKSPACE_ROOT/datafusion/sqllogictest/test_files/scratch/unnest/ordered_tuples.parquet]]}, projection=[struct(column1@0, column2@1, column3@2) as __unnest_placeholder(struct(t.column1,t.column2,t.column3))], file_type=parquet
# cleanup
statement ok
@@ -1152,12 +1156,14 @@ EXPLAIN SELECT UNNEST(column1), column2 FROM t ORDER BY column2;
----
logical_plan
01)Sort: t.column2 ASC NULLS LAST
-02)--Unnest: lists[] structs[__unnest_placeholder(t.column1)]
-03)----Projection: t.column1 AS __unnest_placeholder(t.column1), t.column2
-04)------TableScan: t projection=[column1, column2]
+02)--Projection: __unnest_placeholder(t.column1).s1 AS t.column1.s1, __unnest_placeholder(t.column1).s2 AS t.column1.s2, __unnest_placeholder(t.column1).s3 AS t.column1.s3, t.column2
+03)----Unnest: lists[] structs[__unnest_placeholder(t.column1)]
+04)------Projection: t.column1 AS __unnest_placeholder(t.column1), t.column2
+05)--------TableScan: t projection=[column1, column2]
physical_plan
-01)UnnestExec
-02)--DataSourceExec: file_groups={1 group: [[WORKSPACE_ROOT/datafusion/sqllogictest/test_files/scratch/unnest/ordered_struct.parquet]]}, projection=[column1@0 as __unnest_placeholder(t.column1), column2], output_ordering=[column2@1 ASC NULLS LAST], file_type=parquet
+01)ProjectionExec: expr=[__unnest_placeholder(t.column1).s1@0 as t.column1.s1, __unnest_placeholder(t.column1).s2@1 as t.column1.s2, __unnest_placeholder(t.column1).s3@2 as t.column1.s3, column2@3 as column2]
+02)--UnnestExec
+03)----DataSourceExec: file_groups={1 group: [[WORKSPACE_ROOT/datafusion/sqllogictest/test_files/scratch/unnest/ordered_struct.parquet]]}, projection=[column1@0 as __unnest_placeholder(t.column1), column2], output_ordering=[column2@1 ASC NULLS LAST], file_type=parquet
# cleanup
statement ok
@@ -1220,12 +1226,12 @@ EXPLAIN SELECT UNNEST(UNNEST(column1)), UNNEST(column2), UNNEST(column3), column
----
logical_plan
01)Sort: t.column4 ASC NULLS LAST
-02)--Projection: __unnest_placeholder(t.column1,depth=2) AS UNNEST(UNNEST(t.column1)), __unnest_placeholder(t.column2,depth=1) AS UNNEST(t.column2), __unnest_placeholder(t.column3).s1, __unnest_placeholder(t.column3).s2, __unnest_placeholder(t.column3).s3, t.column4
+02)--Projection: __unnest_placeholder(t.column1,depth=2) AS UNNEST(UNNEST(t.column1)), __unnest_placeholder(t.column2,depth=1) AS UNNEST(t.column2), __unnest_placeholder(t.column3).s1 AS t.column3.s1, __unnest_placeholder(t.column3).s2 AS t.column3.s2, __unnest_placeholder(t.column3).s3 AS t.column3.s3, t.column4
03)----Unnest: lists[__unnest_placeholder(t.column1)|depth=2, __unnest_placeholder(t.column2)|depth=1] structs[__unnest_placeholder(t.column3)]
04)------Projection: t.column1 AS __unnest_placeholder(t.column1), t.column2 AS __unnest_placeholder(t.column2), t.column3 AS __unnest_placeholder(t.column3), t.column4
05)--------TableScan: t projection=[column1, column2, column3, column4]
physical_plan
-01)ProjectionExec: expr=[__unnest_placeholder(t.column1,depth=2)@0 as UNNEST(UNNEST(t.column1)), __unnest_placeholder(t.column2,depth=1)@1 as UNNEST(t.column2), __unnest_placeholder(t.column3).s1@2 as __unnest_placeholder(t.column3).s1, __unnest_placeholder(t.column3).s2@3 as __unnest_placeholder(t.column3).s2, __unnest_placeholder(t.column3).s3@4 as __unnest_placeholder(t.column3).s3, column4@5 as column4]
+01)ProjectionExec: expr=[__unnest_placeholder(t.column1,depth=2)@0 as UNNEST(UNNEST(t.column1)), __unnest_placeholder(t.column2,depth=1)@1 as UNNEST(t.column2), __unnest_placeholder(t.column3).s1@2 as t.column3.s1, __unnest_placeholder(t.column3).s2@3 as t.column3.s2, __unnest_placeholder(t.column3).s3@4 as t.column3.s3, column4@5 as column4]
02)--UnnestExec
03)----DataSourceExec: file_groups={1 group: [[WORKSPACE_ROOT/datafusion/sqllogictest/test_files/scratch/unnest/ordered_struct_arrays.parquet]]}, projection=[column1@0 as __unnest_placeholder(t.column1), column2@1 as __unnest_placeholder(t.column2), column3@2 as __unnest_placeholder(t.column3), column4], output_ordering=[column4@3 ASC NULLS LAST], file_type=parquet
diff --git a/docs/source/user-guide/sql/special_functions.md b/docs/source/user-guide/sql/special_functions.md
index 4f2a39f642..f4b1ea43af 100644
--- a/docs/source/user-guide/sql/special_functions.md
+++ b/docs/source/user-guide/sql/special_functions.md
@@ -69,7 +69,7 @@ Expands an array or map into rows.
### `unnest (struct)`
Expand a struct fields into individual columns.
-Each field of the struct will be prefixed with `__unnest_placeholder` and could be accessed via `"__unnest_placeholder(<struct>).<field>"`.
+Each field of the struct can be accessed via `"<table>.<struct>.<field>"`.
#### Arguments
@@ -93,7 +93,7 @@ Each field of the struct will be prefixed with `__unnest_placeholder` and could
> select unnest(struct_column) from foov;
+--------------------------------------------+--------------------------------------------+
-| __unnest_placeholder(foov.struct_column).a | __unnest_placeholder(foov.struct_column).b |
+| foov.struct_column.a | foov.struct_column.b |
+--------------------------------------------+--------------------------------------------+
| 5 | a string |
| 6 | another string |
---------------------------------------------------------------------
To unsubscribe, e-mail: commits-unsubscribe@datafusion.apache.org
For additional commands, e-mail: commits-help@datafusion.apache.org