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sql: add catalog.Partitioning interface
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This commit aims at reducing direct usage of
descpb.PartitioningDescriptor types and instead using the new
catalog.Partitioning interface. This refactoring is in line with recent
virtualization work tracked under cockroachdb#56306.

In an effort to improve readability and ability to reason about state
changes, this commit changes the type signature of sql.CreatePartitioning
and, notably, removes its side-effects on the index descriptor. The
latter is now modified using a new tabledesc.UpdateIndexPartitioning
function.

Release note: None
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Marius Posta committed Apr 27, 2021
1 parent fd2ab67 commit 2415fff
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Showing 27 changed files with 624 additions and 456 deletions.
1 change: 1 addition & 0 deletions pkg/ccl/partitionccl/BUILD.bazel
View file
Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,7 @@ go_library(
"//pkg/sql/types",
"//pkg/util/encoding",
"//pkg/util/errorutil/unimplemented",
"//pkg/util/log",
"@com_github_cockroachdb_errors//:errors",
],
)
Expand Down
159 changes: 73 additions & 86 deletions pkg/ccl/partitionccl/partition.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,7 @@ import (
"github.com/cockroachdb/cockroach/pkg/sql/types"
"github.com/cockroachdb/cockroach/pkg/util/encoding"
"github.com/cockroachdb/cockroach/pkg/util/errorutil/unimplemented"
"github.com/cockroachdb/cockroach/pkg/util/log"
"github.com/cockroachdb/errors"
)

Expand Down Expand Up @@ -149,7 +150,7 @@ func createPartitioningImpl(
ctx context.Context,
evalCtx *tree.EvalContext,
tableDesc *tabledesc.Mutable,
indexDesc *descpb.IndexDescriptor,
newIdxColumnNames []string,
partBy *tree.PartitionBy,
allowedNewColumnNames []tree.Name,
numImplicitColumns int,
Expand All @@ -166,7 +167,7 @@ func createPartitioningImpl(
// We don't have the fields for our parent partitions handy, but we can use
// the names from the index we're partitioning. They must have matched or we
// would have already returned an error.
partCols := append([]string(nil), indexDesc.ColumnNames[:colOffset]...)
partCols := append([]string(nil), newIdxColumnNames[:colOffset]...)
for _, p := range partBy.Fields {
partCols = append(partCols, string(p))
}
Expand All @@ -175,16 +176,16 @@ func createPartitioningImpl(

var cols []catalog.Column
for i := 0; i < len(partBy.Fields); i++ {
if colOffset+i >= len(indexDesc.ColumnNames) {
if colOffset+i >= len(newIdxColumnNames) {
return partDesc, pgerror.Newf(pgcode.Syntax,
"declared partition columns (%s) exceed the number of columns in index being partitioned (%s)",
partitioningString(), strings.Join(indexDesc.ColumnNames, ", "))
partitioningString(), strings.Join(newIdxColumnNames, ", "))
}
// Search by name because some callsites of this method have not
// allocated ids yet (so they are still all the 0 value).
col, err := findColumnByNameOnTable(
tableDesc,
tree.Name(indexDesc.ColumnNames[colOffset+i]),
tree.Name(newIdxColumnNames[colOffset+i]),
allowedNewColumnNames,
)
if err != nil {
Expand All @@ -197,7 +198,7 @@ func createPartitioningImpl(
n := colOffset + i + 1
return partDesc, pgerror.Newf(pgcode.Syntax,
"declared partition columns (%s) do not match first %d columns in index being partitioned (%s)",
partitioningString(), n, strings.Join(indexDesc.ColumnNames[:n], ", "))
partitioningString(), n, strings.Join(newIdxColumnNames[:n], ", "))
}
}

Expand Down Expand Up @@ -225,7 +226,7 @@ func createPartitioningImpl(
ctx,
evalCtx,
tableDesc,
indexDesc,
newIdxColumnNames,
l.Subpartition,
allowedNewColumnNames,
0, /* implicitColumnNames */
Expand Down Expand Up @@ -263,25 +264,19 @@ func createPartitioningImpl(
return partDesc, nil
}

// detectImplicitPartitionColumns detects implicit partitioning columns
// and returns a new index descriptor with the implicit columns modified
// on the index descriptor and the number of implicit columns prepended.
func detectImplicitPartitionColumns(
evalCtx *tree.EvalContext,
// collectImplicitPartitionColumns collects implicit partitioning columns.
func collectImplicitPartitionColumns(
tableDesc *tabledesc.Mutable,
indexDesc descpb.IndexDescriptor,
indexFirstColumnName string,
partBy *tree.PartitionBy,
allowedNewColumnNames []tree.Name,
) (descpb.IndexDescriptor, int, error) {
) (implicitCols []catalog.Column, _ error) {
seenImplicitColumnNames := map[string]struct{}{}
var implicitColumnIDs []descpb.ColumnID
var implicitColumns []string
var implicitColumnDirections []descpb.IndexDescriptor_Direction
// Iterate over each field in the PARTITION BY until it matches the start
// of the actual explicitly indexed columns.
for _, field := range partBy.Fields {
// As soon as the fields match, we have no implicit columns to add.
if string(field) == indexDesc.ColumnNames[0] {
if string(field) == indexFirstColumnName {
break
}

Expand All @@ -291,27 +286,20 @@ func detectImplicitPartitionColumns(
allowedNewColumnNames,
)
if err != nil {
return indexDesc, 0, err
return nil, err
}
if _, ok := seenImplicitColumnNames[col.GetName()]; ok {
return indexDesc, 0, pgerror.Newf(
return nil, pgerror.Newf(
pgcode.InvalidObjectDefinition,
`found multiple definitions in partition using column "%s"`,
col.GetName(),
)
}
seenImplicitColumnNames[col.GetName()] = struct{}{}
implicitColumns = append(implicitColumns, col.GetName())
implicitColumnIDs = append(implicitColumnIDs, col.GetID())
implicitColumnDirections = append(implicitColumnDirections, descpb.IndexDescriptor_ASC)
implicitCols = append(implicitCols, col)
}

if len(implicitColumns) > 0 {
indexDesc.ColumnNames = append(implicitColumns, indexDesc.ColumnNames...)
indexDesc.ColumnIDs = append(implicitColumnIDs, indexDesc.ColumnIDs...)
indexDesc.ColumnDirections = append(implicitColumnDirections, indexDesc.ColumnDirections...)
}
return indexDesc, len(implicitColumns), nil
return implicitCols, nil
}

// findColumnByNameOnTable finds the given column from the table.
Expand Down Expand Up @@ -348,74 +336,72 @@ func createPartitioning(
partBy *tree.PartitionBy,
allowedNewColumnNames []tree.Name,
allowImplicitPartitioning bool,
) (descpb.IndexDescriptor, error) {
) (newImplicitCols []catalog.Column, newPartitioning descpb.PartitioningDescriptor, err error) {
org := sql.ClusterOrganization.Get(&st.SV)
if err := utilccl.CheckEnterpriseEnabled(st, evalCtx.ClusterID, org, "partitions"); err != nil {
return indexDesc, err
return nil, newPartitioning, err
}

// Truncate existing implicitly partitioned columns.
// Truncate existing implicitly partitioned column names.
oldNumImplicitColumns := int(indexDesc.Partitioning.NumImplicitColumns)
oldImplicitColumnIDs := indexDesc.ColumnIDs[:oldNumImplicitColumns]
newIdxColumnNames := indexDesc.ColumnNames[oldNumImplicitColumns:]

indexDesc.ColumnIDs = indexDesc.ColumnIDs[oldNumImplicitColumns:]
indexDesc.ColumnNames = indexDesc.ColumnNames[oldNumImplicitColumns:]
indexDesc.ColumnDirections = indexDesc.ColumnDirections[oldNumImplicitColumns:]

var numImplicitColumns int
var err error
if allowImplicitPartitioning {
indexDesc, numImplicitColumns, err = detectImplicitPartitionColumns(
evalCtx,
newImplicitCols, err = collectImplicitPartitionColumns(
tableDesc,
indexDesc,
newIdxColumnNames[0],
partBy,
allowedNewColumnNames,
)
if err != nil {
return indexDesc, err
return nil, newPartitioning, err
}
if numImplicitColumns > 0 {
if err := checkClusterSupportsImplicitPartitioning(evalCtx); err != nil {
return indexDesc, err
}
}
if len(newImplicitCols) > 0 {
if err := checkClusterSupportsImplicitPartitioning(evalCtx); err != nil {
return nil, newPartitioning, err
}
// Prepend with new implicit column names.
newIdxColumnNames = make([]string, len(newImplicitCols), len(newImplicitCols)+len(newIdxColumnNames))
for i, col := range newImplicitCols {
newIdxColumnNames[i] = col.GetName()
}
newIdxColumnNames = append(newIdxColumnNames, indexDesc.ColumnNames[oldNumImplicitColumns:]...)
}

// If we had implicit column partitioning beforehand, check we have the
// same implicitly partitioned columns.
// Having different implicitly partitioned columns requires rewrites,
// which is outside the scope of createPartitioning.
if oldNumImplicitColumns > 0 {
if numImplicitColumns != oldNumImplicitColumns {
return indexDesc, errors.AssertionFailedf(
if len(newImplicitCols) != oldNumImplicitColumns {
return nil, newPartitioning, errors.AssertionFailedf(
"mismatching number of implicit columns: old %d vs new %d",
oldNumImplicitColumns,
numImplicitColumns,
len(newImplicitCols),
)
}
for i, oldColID := range oldImplicitColumnIDs {
if oldColID != indexDesc.ColumnIDs[i] {
return indexDesc, errors.AssertionFailedf("found new implicit partitioning at index %d", i)
for i, col := range newImplicitCols {
if indexDesc.ColumnIDs[i] != col.GetID() {
return nil, newPartitioning, errors.AssertionFailedf("found new implicit partitioning at column ordinal %d", i)
}
}
}

partitioning, err := createPartitioningImpl(
newPartitioning, err = createPartitioningImpl(
ctx,
evalCtx,
tableDesc,
&indexDesc,
newIdxColumnNames,
partBy,
allowedNewColumnNames,
numImplicitColumns,
len(newImplicitCols),
0, /* colOffset */
)
if err != nil {
return indexDesc, err
return nil, descpb.PartitioningDescriptor{}, err
}
indexDesc.Partitioning = partitioning
return indexDesc, err
return newImplicitCols, newPartitioning, err
}

// selectPartitionExprs constructs an expression for selecting all rows in the
Expand All @@ -434,7 +420,7 @@ func selectPartitionExprs(
AddMutations: true,
}, func(idx catalog.Index) error {
return selectPartitionExprsByName(
a, evalCtx, tableDesc, idx, &idx.IndexDesc().Partitioning, prefixDatums, exprsByPartName, true /* genExpr */)
a, evalCtx, tableDesc, idx, idx.GetPartitioning(), prefixDatums, exprsByPartName, true /* genExpr */)
}); err != nil {
return nil, err
}
Expand Down Expand Up @@ -488,38 +474,37 @@ func selectPartitionExprsByName(
evalCtx *tree.EvalContext,
tableDesc catalog.TableDescriptor,
idx catalog.Index,
partDesc *descpb.PartitioningDescriptor,
part catalog.Partitioning,
prefixDatums tree.Datums,
exprsByPartName map[string]tree.TypedExpr,
genExpr bool,
) error {
if partDesc.NumColumns == 0 {
if part.NumColumns() == 0 {
return nil
}

// Setting genExpr to false skips the expression generation and only
// registers each descendent partition in the map with a placeholder entry.
if !genExpr {
for _, l := range partDesc.List {
exprsByPartName[l.Name] = tree.DBoolFalse
err := part.ForEachList(func(name string, _ [][]byte, subPartitioning catalog.Partitioning) error {
exprsByPartName[name] = tree.DBoolFalse
var fakeDatums tree.Datums
if err := selectPartitionExprsByName(
a, evalCtx, tableDesc, idx, &l.Subpartitioning, fakeDatums, exprsByPartName, genExpr,
); err != nil {
return err
}
}
for _, r := range partDesc.Range {
exprsByPartName[r.Name] = tree.DBoolFalse
return selectPartitionExprsByName(a, evalCtx, tableDesc, idx, subPartitioning, fakeDatums, exprsByPartName, genExpr)
})
if err != nil {
return err
}
return nil
return part.ForEachRange(func(name string, _, _ []byte) error {
exprsByPartName[name] = tree.DBoolFalse
return nil
})
}

var colVars tree.Exprs
{
// The recursive calls of selectPartitionExprsByName don't pass though
// the column ordinal references, so reconstruct them here.
colVars = make(tree.Exprs, len(prefixDatums)+int(partDesc.NumColumns))
colVars = make(tree.Exprs, len(prefixDatums)+part.NumColumns())
for i := range colVars {
col, err := tabledesc.FindPublicColumnWithID(tableDesc, idx.GetColumnID(i))
if err != nil {
Expand All @@ -529,7 +514,7 @@ func selectPartitionExprsByName(
}
}

if len(partDesc.List) > 0 {
if part.NumList() > 0 {
type exprAndPartName struct {
expr tree.TypedExpr
name string
Expand All @@ -539,12 +524,11 @@ func selectPartitionExprsByName(
// `(1, 2)`, the expr for the former must exclude the latter. This is
// done by bucketing the expression for each partition value by the
// number of DEFAULTs it involves.
partValueExprs := make([][]exprAndPartName, int(partDesc.NumColumns)+1)
partValueExprs := make([][]exprAndPartName, part.NumColumns()+1)

for _, l := range partDesc.List {
for _, valueEncBuf := range l.Values {
t, _, err := rowenc.DecodePartitionTuple(
a, evalCtx.Codec, tableDesc, idx, partDesc, valueEncBuf, prefixDatums)
err := part.ForEachList(func(name string, values [][]byte, subPartitioning catalog.Partitioning) error {
for _, valueEncBuf := range values {
t, _, err := rowenc.DecodePartitionTuple(a, evalCtx.Codec, tableDesc, idx, part, valueEncBuf, prefixDatums)
if err != nil {
return err
}
Expand All @@ -562,11 +546,11 @@ func selectPartitionExprsByName(
tree.NewDTuple(tupleTyp, allDatums...))
partValueExprs[len(t.Datums)] = append(partValueExprs[len(t.Datums)], exprAndPartName{
expr: partValueExpr,
name: l.Name,
name: name,
})

genExpr := true
if _, ok := exprsByPartName[l.Name]; ok {
if _, ok := exprsByPartName[name]; ok {
// Presence of a partition name in the exprsByPartName map
// means the caller has expressed an interested in this
// partition, which means any subpartitions can be skipped
Expand All @@ -578,11 +562,15 @@ func selectPartitionExprsByName(
genExpr = false
}
if err := selectPartitionExprsByName(
a, evalCtx, tableDesc, idx, &l.Subpartitioning, allDatums, exprsByPartName, genExpr,
a, evalCtx, tableDesc, idx, subPartitioning, allDatums, exprsByPartName, genExpr,
); err != nil {
return err
}
}
return nil
})
if err != nil {
return err
}

// Walk backward through partValueExprs, so partition values with fewest
Expand Down Expand Up @@ -617,10 +605,9 @@ func selectPartitionExprsByName(
}
}

for range partDesc.Range {
return errors.New("TODO(dan): unsupported for range partitionings")
if part.NumRange() > 0 {
log.Fatal(context.TODO(), "TODO(dan): unsupported for range partitionings")
}

return nil
}

Expand Down
11 changes: 7 additions & 4 deletions pkg/ccl/partitionccl/partition_test.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1342,12 +1342,12 @@ func TestRepartitioning(t *testing.T) {
} else {
fmt.Fprintf(&repartition, `ALTER INDEX %s@%s `, test.new.parsed.tableName, testIndex.GetName())
}
if testIndex.GetPartitioning().NumColumns == 0 {
if testIndex.GetPartitioning().NumColumns() == 0 {
repartition.WriteString(`PARTITION BY NOTHING`)
} else {
if err := sql.ShowCreatePartitioning(
&rowenc.DatumAlloc{}, keys.SystemSQLCodec, test.new.parsed.tableDesc, testIndex,
&testIndex.IndexDesc().Partitioning, &repartition, 0 /* indent */, 0, /* colOffset */
testIndex.GetPartitioning(), &repartition, 0 /* indent */, 0, /* colOffset */
); err != nil {
t.Fatalf("%+v", err)
}
Expand All @@ -1357,8 +1357,11 @@ func TestRepartitioning(t *testing.T) {
// Verify that repartitioning removes zone configs for partitions that
// have been removed.
newPartitionNames := map[string]struct{}{}
for _, name := range test.new.parsed.tableDesc.PartitionNames() {
newPartitionNames[name] = struct{}{}
for _, index := range test.new.parsed.tableDesc.NonDropIndexes() {
_ = index.GetPartitioning().ForEachPartitionName(func(name string) error {
newPartitionNames[name] = struct{}{}
return nil
})
}
for _, row := range sqlDB.QueryStr(
t, "SELECT partition_name FROM crdb_internal.zones WHERE partition_name IS NOT NULL") {
Expand Down
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