forked from dolthub/go-mysql-server
/
resolve_column_defaults.go
1074 lines (990 loc) · 39.1 KB
/
resolve_column_defaults.go
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// Copyright 2020-2021 Dolthub, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package analyzer
import (
"github.com/dolthub/vitess/go/sqltypes"
"github.com/gabereiser/go-mysql-server/sql"
"github.com/gabereiser/go-mysql-server/sql/expression"
"github.com/gabereiser/go-mysql-server/sql/information_schema"
"github.com/gabereiser/go-mysql-server/sql/parse"
"github.com/gabereiser/go-mysql-server/sql/plan"
"github.com/gabereiser/go-mysql-server/sql/transform"
"github.com/gabereiser/go-mysql-server/sql/types"
)
// validColumnDefaultFuncs is the set of functions that are legal in a column default value
var validColumnDefaultFuncs = map[string]struct{}{
"abs": {},
"acos": {},
"adddate": {},
"addtime": {},
"aes_decrypt": {},
"aes_encrypt": {},
"any_value": {},
"ascii": {},
"asin": {},
"atan2": {},
"atan": {},
"avg": {},
"benchmark": {},
"bin": {},
"bin_to_uuid": {},
"bit_and": {},
"bit_length": {},
"bit_count": {},
"bit_or": {},
"bit_xor": {},
"can_access_column": {},
"can_access_database": {},
"can_access_table": {},
"can_access_view": {},
"cast": {},
"ceil": {},
"ceiling": {},
"char": {},
"char_length": {},
"character_length": {},
"charset": {},
"coalesce": {},
"coercibility": {},
"collation": {},
"compress": {},
"concat": {},
"concat_ws": {},
"connection_id": {},
"conv": {},
"convert": {},
"convert_tz": {},
"cos": {},
"cot": {},
"count": {},
"crc32": {},
"cume_dist": {},
"curdate": {},
"current_role": {},
"current_timestamp": {},
"curtime": {},
"database": {},
"date": {},
"date_add": {},
"date_format": {},
"date_sub": {},
"datediff": {},
"day": {},
"dayname": {},
"dayofmonth": {},
"dayofweek": {},
"dayofyear": {},
"default": {},
"degrees": {},
"dense_rank": {},
"elt": {},
"exp": {},
"export_set": {},
"extract": {},
"extractvalue": {},
"field": {},
"find_in_set": {},
"first_value": {},
"floor": {},
"format": {},
"format_bytes": {},
"format_pico_time": {},
"found_rows": {},
"from_base64": {},
"from_days": {},
"from_unixtime": {},
"geomcollection": {},
"geometrycollection": {},
"get_dd_column_privileges": {},
"get_dd_create_options": {},
"get_dd_index_sub_part_length": {},
"get_format": {},
"get_lock": {},
"greatest": {},
"group_concat": {},
"grouping": {},
"gtid_subset": {},
"gtid_subtract": {},
"hex": {},
"hour": {},
"icu_version": {},
"if": {},
"ifnull": {},
"in": {},
"inet_aton": {},
"inet_ntoa": {},
"inet6_aton": {},
"inet6_ntoa": {},
"insert": {},
"instr": {},
"internal_auto_increment": {},
"internal_avg_row_length": {},
"internal_check_time": {},
"internal_checksum": {},
"internal_data_free": {},
"internal_data_length": {},
"internal_dd_char_length": {},
"internal_get_comment_or_error": {},
"internal_get_enabled_role_json": {},
"internal_get_hostname": {},
"internal_get_username": {},
"internal_get_view_warning_or_error": {},
"internal_index_column_cardinality": {},
"internal_index_length": {},
"internal_is_enabled_role": {},
"internal_is_mandatory_role": {},
"internal_keys_disabled": {},
"internal_max_data_length": {},
"internal_table_rows": {},
"internal_update_time": {},
"interval": {},
"is_free_lock": {},
"is_ipv4": {},
"is_ipv4_compat": {},
"is_ipv4_mapped": {},
"is_ipv6": {},
"is_used_lock": {},
"is_uuid": {},
"isnull": {},
"json_array": {},
"json_array_append": {},
"json_array_insert": {},
"json_arrayagg": {},
"json_contains": {},
"json_contains_path": {},
"json_depth": {},
"json_extract": {},
"json_insert": {},
"json_keys": {},
"json_length": {},
"json_merge": {},
"json_merge_patch": {},
"json_merge_preserve": {},
"json_object": {},
"json_objectagg": {},
"json_overlaps": {},
"json_pretty": {},
"json_quote": {},
"json_remove": {},
"json_replace": {},
"json_schema_valid": {},
"json_schema_validation_report": {},
"json_search": {},
"json_set": {},
"json_storage_free": {},
"json_storage_size": {},
"json_table": {},
"json_type": {},
"json_unquote": {},
"json_valid": {},
"json_value": {},
"lag": {},
"last_insert_id": {},
"last_value": {},
"lcase": {},
"lead": {},
"least": {},
"left": {},
"length": {},
"linestring": {},
"ln": {},
"load_file": {},
"localtimestamp": {},
"locate": {},
"log": {},
"log10": {},
"log2": {},
"lower": {},
"lpad": {},
"ltrim": {},
"make_set": {},
"makedate": {},
"maketime": {},
"master_pos_wait": {},
"max": {},
"mbrcontains": {},
"mbrcoveredby": {},
"mbrcovers": {},
"mbrdisjoint": {},
"mbrequals": {},
"mbrintersects": {},
"mbroverlaps": {},
"mbrtouches": {},
"mbrwithin": {},
"md5": {},
"microsecond": {},
"mid": {},
"min": {},
"minute": {},
"mod": {},
"month": {},
"monthname": {},
"multilinestring": {},
"multipoint": {},
"multipolygon": {},
"name_const": {},
"now": {},
"nth_value": {},
"ntile": {},
"nullif": {},
"oct": {},
"octet_length": {},
"ord": {},
"percent_rank": {},
"period_add": {},
"period_diff": {},
"pi": {},
"point": {},
"polygon": {},
"position": {},
"pow": {},
"power": {},
"ps_current_thread_id": {},
"ps_thread_id": {},
"quarter": {},
"quote": {},
"radians": {},
"rand": {},
"random_bytes": {},
"rank": {},
"regexp_instr": {},
"regexp_like": {},
"regexp_replace": {},
"regexp_substr": {},
"release_all_locks": {},
"release_lock": {},
"repeat": {},
"replace": {},
"reverse": {},
"right": {},
"roles_graphml": {},
"round": {},
"row_count": {},
"row_number": {},
"rpad": {},
"rtrim": {},
"schema": {},
"sec_to_time": {},
"second": {},
"session_user": {},
"sha1": {},
"sha": {},
"sha2": {},
"sign": {},
"sin": {},
"sleep": {},
"soundex": {},
"space": {},
"sqrt": {},
"st_area": {},
"st_asbinary": {},
"st_aswkb": {},
"st_asgeojson": {},
"st_astext": {},
"st_aswkt": {},
"st_buffer": {},
"st_buffer_strategy": {},
"st_centroid": {},
"st_contains": {},
"st_convexhull": {},
"st_crosses": {},
"st_difference": {},
"st_dimension": {},
"st_disjoint": {},
"st_distance": {},
"st_distance_sphere": {},
"st_endpoint": {},
"st_envelope": {},
"st_equals": {},
"st_exteriorring": {},
"st_geohash": {},
"st_geomcollfromtext": {},
"st_geomcollfromtxt": {},
"st_geomcollfromwkb": {},
"st_geometrycollectionfromtext": {},
"st_geometrycollectionfromwkb": {},
"st_geometryn": {},
"st_geometrytype": {},
"st_geomfromgeojson": {},
"st_geomfromtext": {},
"st_geometryfromtext": {},
"st_geomfromwkb": {},
"st_geometryfromwkb": {},
"st_interiorringn": {},
"st_intersection": {},
"st_intersects": {},
"st_isclosed": {},
"st_isempty": {},
"st_issimple": {},
"st_isvalid": {},
"st_latfromgeohash": {},
"st_latitude": {},
"st_length": {},
"st_linefromtext": {},
"st_linestringfromtext": {},
"st_linefromwkb": {},
"st_linestringfromwkb": {},
"st_longfromgeohash": {},
"st_longitude": {},
"st_makeenvelope": {},
"st_mlinefromtext": {},
"st_multilinestringfromtext": {},
"st_mlinefromwkb": {},
"st_multilinestringfromwkb": {},
"st_mpointfromtext": {},
"st_multipointfromtext": {},
"st_mpointfromwkb": {},
"st_multipointfromwkb": {},
"st_mpolyfromtext": {},
"st_multipolygonfromtext": {},
"st_mpolyfromwkb": {},
"st_multipolygonfromwkb": {},
"st_numgeometries": {},
"st_numinteriorring": {},
"st_numinteriorrings": {},
"st_numpoints": {},
"st_overlaps": {},
"st_pointfromgeohash": {},
"st_pointfromtext": {},
"st_pointfromwkb": {},
"st_pointn": {},
"st_polyfromtext": {},
"st_polygonfromtext": {},
"st_polyfromwkb": {},
"st_polygonfromwkb": {},
"st_simplify": {},
"st_srid": {},
"st_startpoint": {},
"st_swapxy": {},
"st_symdifference": {},
"st_touches": {},
"st_transform": {},
"st_union": {},
"st_validate": {},
"st_within": {},
"st_x": {},
"st_y": {},
"statement_digest": {},
"statement_digest_text": {},
"std": {},
"stddev": {},
"stddev_pop": {},
"stddev_samp": {},
"str_to_date": {},
"strcmp": {},
"subdate": {},
"substr": {},
"substring": {},
"substring_index": {},
"subtime": {},
"sum": {},
"sysdate": {},
"system_user": {},
"tan": {},
"time": {},
"time_format": {},
"time_to_sec": {},
"timediff": {},
"timestamp": {},
"timestampadd": {},
"timestampdiff": {},
"to_base64": {},
"to_days": {},
"to_seconds": {},
"trim": {},
"truncate": {},
"ucase": {},
"uncompress": {},
"uncompressed_length": {},
"unhex": {},
"unix_timestamp": {},
"updatexml": {},
"upper": {},
"user": {},
"utc_date": {},
"utc_time": {},
"utc_timestamp": {},
"uuid": {},
"uuid_short": {},
"uuid_to_bin": {},
"validate_password_strength": {},
"values": {},
"var_pop": {},
"var_samp": {},
"variance": {},
"version": {},
"wait_for_executed_gtid_set": {},
"wait_until_sql_thread_after_gtids": {},
"week": {},
"weekday": {},
"weekofyear": {},
"weight_string": {},
"year": {},
"yearweek": {},
}
// Resolving column defaults is a multi-phase process, with different analyzer rules for each phase.
//
// * parseColumnDefaults: Some integrators (dolt but not GMS) store their column defaults as strings, which we need to
// parse into expressions before we can analyze them any further.
// * resolveColumnDefaults: Once we have an expression for a default value, it may contain expressions that need
// simplification before further phases of processing can take place.
//
// After this stage, expressions in column default values are handled by the normal analyzer machinery responsible for
// resolving expressions, including things like columns and functions. Every node that needs to do this for its default
// values implements `sql.Expressioner` to expose such expressions. There is custom logic in `resolveColumns` to help
// identify the correct indexes for column references, which can vary based on the node type.
//
// Finally there are cleanup phases:
// * validateColumnDefaults: ensures that newly created column defaults from a DDL statement are legal for the type of
// column, various other business logic checks to match MySQL's logic.
// * stripTableNamesFromDefault: column defaults headed for storage or serialization in a query result need the table
// names in any GetField expressions stripped out so that they serialize to strings without such table names. Table
// names in GetField expressions are expected in much of the rest of the analyzer, so we do this after the bulk of
// analyzer work.
//
// The `information_schema.columns` table also needs access to the default values of every column in the database, and
// because it's a table it can't implement `sql.Expressioner` like other node types. Instead it has special handling
// here, as well as in the `resolve_functions` rule.
func validateColumnDefaults(ctx *sql.Context, _ *Analyzer, n sql.Node, _ *Scope, _ RuleSelector) (sql.Node, transform.TreeIdentity, error) {
span, ctx := ctx.Span("validateColumnDefaults")
defer span.End()
return transform.Node(n, func(n sql.Node) (sql.Node, transform.TreeIdentity, error) {
switch node := n.(type) {
case *plan.AlterDefaultSet:
table := getResolvedTable(node)
sch := table.Schema()
index := sch.IndexOfColName(node.ColumnName)
col := sch[index]
eWrapper := expression.WrapExpression(node.Default)
err := validateColumnDefault(ctx, col, eWrapper)
if err != nil {
return node, transform.SameTree, err
}
return node, transform.SameTree, nil
case sql.SchemaTarget:
switch node.(type) {
case *plan.AlterPK, *plan.AddColumn, *plan.ModifyColumn, *plan.AlterDefaultDrop, *plan.CreateTable, *plan.DropColumn:
// DDL nodes must validate any new column defaults, continue to logic below
default:
// other node types are not altering the schema and therefore don't need validation of column defaults
return n, transform.SameTree, nil
}
// There may be multiple DDL nodes in the plan (ALTER TABLE statements can have many clauses), and for each of them
// we need to count the column indexes in the very hacky way outlined above.
colIndex := 0
return transform.NodeExprs(n, func(e sql.Expression) (sql.Expression, transform.TreeIdentity, error) {
eWrapper, ok := e.(*expression.Wrapper)
if !ok {
return e, transform.SameTree, nil
}
col, err := lookupColumnForTargetSchema(ctx, node, colIndex)
if err != nil {
return nil, transform.SameTree, err
}
colIndex++
err = validateColumnDefault(ctx, col, eWrapper)
if err != nil {
return nil, transform.SameTree, err
}
return e, transform.SameTree, nil
})
default:
return node, transform.SameTree, nil
}
})
}
func resolveColumnDefaults(ctx *sql.Context, _ *Analyzer, n sql.Node, _ *Scope, _ RuleSelector) (sql.Node, transform.TreeIdentity, error) {
span, ctx := ctx.Span("resolveColumnDefaults")
defer span.End()
return transform.Node(n, func(n sql.Node) (sql.Node, transform.TreeIdentity, error) {
// There may be multiple DDL nodes in the plan (ALTER TABLE statements can have many clauses), and for each of them
// we need to count the column indexes as we transform expressions
colIndex := 0
switch node := n.(type) {
case *plan.InsertDestination:
return transform.NodeExprs(node, func(e sql.Expression) (sql.Expression, transform.TreeIdentity, error) {
eWrapper, ok := e.(*expression.Wrapper)
if !ok {
return e, transform.SameTree, nil
}
table := getResolvedTable(node)
sch := table.Schema()
if colIndex >= len(sch) {
return e, transform.SameTree, nil
}
col := sch[colIndex]
colIndex++
return resolveColumnDefault(ctx, col, eWrapper)
})
case *plan.InsertInto:
// node.Source needs to be explicitly handled here because it's not a
// registered child of InsertInto
newSource, identity, err := transform.NodeExprs(node.Source, func(e sql.Expression) (sql.Expression, transform.TreeIdentity, error) {
eWrapper, ok := e.(*expression.Wrapper)
if !ok {
return e, transform.SameTree, nil
}
// Instead of grabbing the schema from TargetSchema(), use the Destination node
sch := node.Destination.Schema()
// InsertInto.Source can contain multiple rows, so loop over the included columns
colIndex = colIndex % len(node.ColumnNames)
// Columns can be specified in any order, so use the order from the InsertInto statement
schemaIndex := sch.IndexOfColName(node.ColumnNames[colIndex])
if schemaIndex == -1 {
return nil, transform.SameTree, sql.ErrColumnNotFound.New(node.ColumnNames[colIndex])
}
col := sch[schemaIndex]
colIndex++
return resolveColumnDefault(ctx, col, eWrapper)
})
if identity == transform.NewTree {
node.Source = newSource
}
return node, identity, err
case *plan.AlterDefaultSet:
table := getResolvedTable(node)
sch := table.Schema()
index := sch.IndexOfColName(node.ColumnName)
col := sch[index]
eWrapper := expression.WrapExpression(node.Default)
newExpr, same, err := resolveColumnDefault(ctx, col, eWrapper)
if err != nil {
return node, transform.SameTree, err
}
if same {
return node, transform.SameTree, nil
}
newNode, err := node.WithDefault(newExpr)
if err != nil {
return node, transform.SameTree, err
}
return newNode, transform.NewTree, nil
case sql.SchemaTarget:
return transform.NodeExprs(n, func(e sql.Expression) (sql.Expression, transform.TreeIdentity, error) {
eWrapper, ok := e.(*expression.Wrapper)
if !ok {
return e, transform.SameTree, nil
}
col, err := lookupColumnForTargetSchema(ctx, node, colIndex)
if err != nil {
return nil, transform.SameTree, err
}
colIndex++
return resolveColumnDefault(ctx, col, eWrapper)
})
case *plan.ResolvedTable:
ct, ok := node.Table.(*information_schema.ColumnsTable)
if !ok {
return node, transform.SameTree, nil
}
allColumns, err := ct.AllColumns(ctx)
if err != nil {
return nil, transform.SameTree, err
}
allDefaults, same, err := transform.Exprs(transform.WrappedColumnDefaults(allColumns), func(e sql.Expression) (sql.Expression, transform.TreeIdentity, error) {
eWrapper, ok := e.(*expression.Wrapper)
if !ok {
return e, transform.SameTree, nil
}
colIdx := colIndex
colIndex++
return resolveColumnDefault(ctx, allColumns[colIdx], eWrapper)
})
if err != nil {
return nil, transform.SameTree, err
}
if !same {
node.Table, err = ct.WithColumnDefaults(allDefaults)
if err != nil {
return nil, transform.SameTree, err
}
}
return node, transform.NewTree, err
default:
return node, transform.SameTree, nil
}
})
}
// stripTableNamesFromColumnDefaults removes the table name from any GetField expressions in column default expressions.
// Default values can only reference their host table, and since we serialize the GetField expression for storage, it's
// important that we remove the table name before passing it off for storage. Otherwise we end up with serialized
// defaults like `tableName.field + 1` instead of just `field + 1`.
func stripTableNamesFromColumnDefaults(ctx *sql.Context, _ *Analyzer, n sql.Node, _ *Scope, _ RuleSelector) (sql.Node, transform.TreeIdentity, error) {
span, ctx := ctx.Span("stripTableNamesFromColumnDefaults")
defer span.End()
return transform.Node(n, func(n sql.Node) (sql.Node, transform.TreeIdentity, error) {
switch node := n.(type) {
case *plan.AlterDefaultSet:
eWrapper := expression.WrapExpression(node.Default)
newExpr, same, err := stripTableNamesFromDefault(eWrapper)
if err != nil {
return node, transform.SameTree, err
}
if same {
return node, transform.SameTree, nil
}
newNode, err := node.WithDefault(newExpr)
if err != nil {
return node, transform.SameTree, err
}
return newNode, transform.NewTree, nil
case sql.SchemaTarget:
return transform.NodeExprs(n, func(e sql.Expression) (sql.Expression, transform.TreeIdentity, error) {
eWrapper, ok := e.(*expression.Wrapper)
if !ok {
return e, transform.SameTree, nil
}
return stripTableNamesFromDefault(eWrapper)
})
case *plan.ResolvedTable:
ct, ok := node.Table.(*information_schema.ColumnsTable)
if !ok {
return node, transform.SameTree, nil
}
allColumns, err := ct.AllColumns(ctx)
if err != nil {
return nil, transform.SameTree, err
}
allDefaults, same, err := transform.Exprs(transform.WrappedColumnDefaults(allColumns), func(e sql.Expression) (sql.Expression, transform.TreeIdentity, error) {
eWrapper, ok := e.(*expression.Wrapper)
if !ok {
return e, transform.SameTree, nil
}
return stripTableNamesFromDefault(eWrapper)
})
if err != nil {
return nil, transform.SameTree, err
}
if !same {
node.Table, err = ct.WithColumnDefaults(allDefaults)
if err != nil {
return nil, transform.SameTree, err
}
return node, transform.NewTree, err
}
return node, transform.SameTree, err
default:
return node, transform.SameTree, nil
}
})
}
// lookupColumnForTargetSchema looks at the target schema for the specified SchemaTarget node and returns
// the column based on the specified index. For most node types, this is simply indexing into the target
// schema but a few types require special handling.
func lookupColumnForTargetSchema(_ *sql.Context, node sql.SchemaTarget, colIndex int) (*sql.Column, error) {
schema := node.TargetSchema()
switch n2 := node.(type) {
case *plan.ModifyColumn:
if colIndex < len(schema) {
return schema[colIndex], nil
} else {
return n2.NewColumn(), nil
}
case *plan.AddColumn:
if colIndex < len(schema) {
return schema[colIndex], nil
} else {
return n2.Column(), nil
}
case *plan.AlterDefaultSet:
index := schema.IndexOfColName(n2.ColumnName)
if index == -1 {
return nil, sql.ErrTableColumnNotFound.New(n2.Table, n2.ColumnName)
}
return n2.Schema()[index], nil
default:
if colIndex < len(schema) {
return schema[colIndex], nil
} else {
return nil, sql.ErrColumnNotFound.New(colIndex)
}
}
}
// parseColumnDefaults transforms UnresolvedColumnDefault expressions into ColumnDefaultValue expressions, which
// amounts to parsing the string representation into an actual expression. We only require an actual column default
// value for some node types, where the value will be used.
func parseColumnDefaults(ctx *sql.Context, _ *Analyzer, n sql.Node, _ *Scope, _ RuleSelector) (sql.Node, transform.TreeIdentity, error) {
span, ctx := ctx.Span("parse_column_defaults")
defer span.End()
return transform.Node(n, func(n sql.Node) (sql.Node, transform.TreeIdentity, error) {
switch nn := n.(type) {
case *plan.InsertInto:
if !nn.Destination.Resolved() {
return nn, transform.SameTree, nil
}
var err error
n, err = nn.WithChildren(plan.NewInsertDestination(nn.Destination.Schema(), nn.Destination))
nn = n.(*plan.InsertInto)
if err != nil {
return nil, transform.SameTree, err
}
err = fillInColumnDefaults(ctx, nn)
if err != nil {
return nil, transform.SameTree, err
}
// InsertInto.Source needs special handling, since it is not modeled as a Child
newNode, _, err := parseDefaultsForNode(ctx, nn.Source)
if err != nil {
return nil, transform.SameTree, err
}
nn.Source = newNode
return parseDefaultsForNode(ctx, nn)
case *plan.ResolvedTable:
ct, ok := nn.Table.(*information_schema.ColumnsTable)
if !ok {
return nn, transform.SameTree, nil
}
allColumns, err := ct.AllColumns(ctx)
if err != nil {
return nil, transform.SameTree, err
}
allDefaults, same, err := transform.Exprs(transform.WrappedColumnDefaults(allColumns), func(e sql.Expression) (sql.Expression, transform.TreeIdentity, error) {
eWrapper, ok := e.(*expression.Wrapper)
if !ok {
return e, transform.SameTree, nil
}
newWr, parseSame, err := parseColumnDefault(ctx, eWrapper)
if err != nil {
return nil, transform.SameTree, err
}
newWr, stripSame, err := stripTableNamesFromDefault(newWr.(*expression.Wrapper))
if err != nil {
return nil, false, err
}
return newWr, parseSame && stripSame, nil
})
if err != nil {
return nil, transform.SameTree, err
}
if !same {
nn.Table, err = ct.WithColumnDefaults(allDefaults)
if err != nil {
return nil, transform.SameTree, err
}
return nn, transform.NewTree, err
}
return nn, transform.SameTree, err
default:
return parseDefaultsForNode(ctx, nn)
}
})
}
// parseDefaultsForNode walks over the expressions contained in the specified node and transforms all
// UnresolvedColumnDefaultValues into ColumnDefaultValues.
func parseDefaultsForNode(ctx *sql.Context, input sql.Node) (sql.Node, transform.TreeIdentity, error) {
return transform.NodeExprsWithNode(input, func(node sql.Node, e sql.Expression) (sql.Expression, transform.TreeIdentity, error) {
eWrapper, ok := e.(*expression.Wrapper)
if !ok {
return e, transform.SameTree, nil
}
switch node.(type) {
case *plan.Values, *plan.InsertDestination, sql.SchemaTarget:
return parseColumnDefault(ctx, eWrapper)
default:
return e, transform.SameTree, nil
}
})
}
// fillInColumnDefaults fills in column default expressions for any source data that explicitly used
// the 'DEFAULT' keyword as input. This requires that the InsertInto Destination has been fully resolved
// before the column default values can be used.
func fillInColumnDefaults(_ *sql.Context, insertInto *plan.InsertInto) error {
schema := insertInto.Destination.Schema()
// If the source values are not specified, fill in column default placeholders
if values, ok := insertInto.Source.(*plan.Values); ok {
for i, tuple := range values.ExpressionTuples {
if len(tuple) == 0 {
tuple = make([]sql.Expression, len(insertInto.ColumnNames))
for j, _ := range tuple {
tuple[j] = expression.NewDefaultColumn(insertInto.ColumnNames[j])
}
values.ExpressionTuples[i] = tuple
}
}
}
// Pull the column default values out into the same order the columns were specified
columnDefaultValues := make([]*sql.ColumnDefaultValue, len(insertInto.ColumnNames))
for i, columnName := range insertInto.ColumnNames {
index := schema.IndexOfColName(columnName)
if index == -1 {
return plan.ErrInsertIntoNonexistentColumn.New(columnName)
}
columnDefaultValues[i] = schema[index].Default
}
// Walk through the expression tuples looking for any column defaults to fill in
if values, ok := insertInto.Source.(*plan.Values); ok {
for _, exprTuple := range values.ExpressionTuples {
for i, value := range exprTuple {
newExpression, _, err := transform.Expr(value, func(e sql.Expression) (sql.Expression, transform.TreeIdentity, error) {
if _, ok := e.(*expression.DefaultColumn); ok {
return columnDefaultValues[i], transform.NewTree, nil
}
return e, transform.SameTree, nil
})
if err != nil {
return err
}
exprTuple[i] = expression.WrapExpression(newExpression)
}
}
}
return nil
}
// parseColumnDefault transforms an UnresolvedColumnDefault expression into a ColumnDefaultValue expression
func parseColumnDefault(ctx *sql.Context, e *expression.Wrapper) (sql.Expression, transform.TreeIdentity, error) {
newDefault, ok := e.Unwrap().(*sql.ColumnDefaultValue)
if !ok {
return e, transform.SameTree, nil
}
if newDefault.Resolved() {
return e, transform.SameTree, nil
}
if ucd, ok := newDefault.Expression.(sql.UnresolvedColumnDefault); ok {
var err error
newDefault, err = parse.StringToColumnDefaultValue(ctx, ucd.String())
if err != nil {
return nil, transform.SameTree, err
}
}
return expression.WrapExpression(newDefault), transform.NewTree, nil
}
func resolveColumnDefault(ctx *sql.Context, col *sql.Column, e *expression.Wrapper) (sql.Expression, transform.TreeIdentity, error) {
newDefault, ok := e.Unwrap().(*sql.ColumnDefaultValue)
if !ok {
return e, transform.SameTree, nil
}
if newDefault == nil {
return e, transform.SameTree, nil
}
// TODO: fix the vitess parser so that it parses negative numbers as numbers and not negation of an expression
isLiteral := newDefault.IsLiteral()
if unaryMinusExpr, ok := newDefault.Expression.(*expression.UnaryMinus); ok {
if literalExpr, ok := unaryMinusExpr.Child.(*expression.Literal); ok {
switch val := literalExpr.Value().(type) {
case float32:
newDefault.Expression = expression.NewLiteral(-val, types.Float32)
isLiteral = true
case float64:
newDefault.Expression = expression.NewLiteral(-val, types.Float64)
isLiteral = true
}
}
}
var err error
newDefault, err = sql.NewColumnDefaultValue(newDefault.Expression, col.Type, isLiteral, newDefault.IsParenthesized(), col.Nullable)
if err != nil {
return nil, transform.SameTree, err
}
return expression.WrapExpression(newDefault), transform.NewTree, nil
}
// validateColumnDefault validates that the column default expression is valid for the column type and returns an error
// if not
func validateColumnDefault(ctx *sql.Context, col *sql.Column, e *expression.Wrapper) error {
newDefault, ok := e.Unwrap().(*sql.ColumnDefaultValue)
if !ok {
return nil
}
if newDefault == nil {
return nil
}
// Some column types can only have a NULL for a literal default, must be an expression otherwise
isLiteralRestrictedType := types.IsTextBlob(col.Type) || types.IsJSON(col.Type) || types.IsGeometry(col.Type)
if isLiteralRestrictedType && newDefault.IsLiteral() {
lit, err := newDefault.Expression.Eval(ctx, nil)
if err != nil {
return err
}
if lit != nil {
return sql.ErrInvalidTextBlobColumnDefault.New()
}
}
var err error
sql.Inspect(newDefault.Expression, func(e sql.Expression) bool {
switch e.(type) {
case sql.FunctionExpression, *expression.UnresolvedFunction:
var funcName string
switch expr := e.(type) {
case sql.FunctionExpression:
funcName = expr.FunctionName()
case *expression.UnresolvedFunction:
funcName = expr.Name()
}
if _, isValid := validColumnDefaultFuncs[funcName]; !isValid {
err = sql.ErrInvalidColumnDefaultFunction.New(funcName, col.Name)