sql: Adding support for show indexes from database command

docs/generated/sql/bnf/stmt_block.bnf

@@ -472,8 +472,11 @@ show_grants_stmt ::=
 
 show_indexes_stmt ::=
 	'SHOW' 'INDEX' 'FROM' table_name
+	| 'SHOW' 'INDEX' 'FROM' 'DATABASE' database_name
 	| 'SHOW' 'INDEXES' 'FROM' table_name
+	| 'SHOW' 'INDEXES' 'FROM' 'DATABASE' database_name
 	| 'SHOW' 'KEYS' 'FROM' table_name
+	| 'SHOW' 'KEYS' 'FROM' 'DATABASE' database_name
 
 show_jobs_stmt ::=
 	'SHOW' opt_automatic 'JOBS'

pkg/sql/delegate/delegate.go

@@ -49,6 +49,9 @@ func TryDelegate(
 	case *tree.ShowCreate:
 		return d.delegateShowCreate(t)
 
+	case *tree.ShowDatabaseIndexes:
+		return d.delegateShowDatabaseIndexes(t)
+
 	case *tree.ShowIndexes:
 		return d.delegateShowIndexes(t)
 

pkg/sql/delegate/show_table.go

@@ -34,6 +34,22 @@ func (d *delegator) delegateShowCreate(n *tree.ShowCreate) (tree.Statement, erro
 	return d.showTableDetails(n.Name, showCreateQuery)
 }
 
+func (d *delegator) delegateShowDatabaseIndexes(
+	n *tree.ShowDatabaseIndexes,
+) (tree.Statement, error) {
+	const getAllIndexesQuery = `
+    SELECT table_name,
+           index_name,
+           non_unique::BOOL,
+           seq_in_index,
+           column_name,
+           direction,
+           storing::BOOL,
+           implicit::BOOL
+    FROM %s.information_schema.statistics`
+	return parse(fmt.Sprintf(getAllIndexesQuery, n.Database.String()))
+}
+
 func (d *delegator) delegateShowIndexes(n *tree.ShowIndexes) (tree.Statement, error) {
 	const getIndexesQuery = `
     SELECT table_name,

pkg/sql/logictest/testdata/logic_test/show_source

@@ -331,3 +331,35 @@ code      42601
 file      sql/parser/show_syntax.go
 function  RunShowSyntax
 detail    source SQL: foo ^
+
+
+# Test the SHOW INDEXES FROM DATABSE COMMAND
+statement ok
+CREATE DATABASE showdbindexestest;
+
+statement ok
+CREATE TABLE showdbindexestest.table1 (key1 INT PRIMARY KEY);
+
+statement ok
+CREATE TABLE showdbindexestest.table2 (key2 INT PRIMARY KEY);
+
+query TTBITTBB
+SHOW INDEXES FROM DATABASE showdbindexestest;
+----
+table1 primary false 1 key1 ASC false false
+table2 primary false 1 key2 ASC false false
+
+statement ok
+CREATE DATABASE "$peci@l";
+
+statement ok
+CREATE TABLE "$peci@l".table1 (key1 INT PRIMARY KEY);
+
+statement ok
+CREATE TABLE "$peci@l".table2 (key2 INT PRIMARY KEY);
+
+query TTBITTBB
+SHOW INDEXES FROM DATABASE "$peci@l";
+----
+table1 primary false 1 key1 ASC false false
+table2 primary false 1 key2 ASC false false

pkg/sql/parser/parse_test.go

@@ -410,6 +410,7 @@ func TestParse(t *testing.T) {
 		{`SHOW INDEXES FROM a`},
 		{`EXPLAIN SHOW INDEXES FROM a`},
 		{`SHOW INDEXES FROM a.b.c`},
+		{`SHOW INDEXES FROM DATABASE a`},
 		{`SHOW CONSTRAINTS FROM a`},
 		{`SHOW CONSTRAINTS FROM a.b.c`},
 		{`EXPLAIN SHOW CONSTRAINTS FROM a.b.c`},

pkg/sql/parser/sql.y

@@ -3347,23 +3347,35 @@ show_grants_stmt:
 
 // %Help: SHOW INDEXES - list indexes
 // %Category: DDL
-// %Text: SHOW INDEXES FROM <tablename>
+// %Text: SHOW INDEXES FROM { <tablename> | DATABASE <database_name> }
 // %SeeAlso: WEBDOCS/show-index.html
 show_indexes_stmt:
   SHOW INDEX FROM table_name
   {
     $$.val = &tree.ShowIndexes{Table: $4.unresolvedObjectName()}
   }
 | SHOW INDEX error // SHOW HELP: SHOW INDEXES
+| SHOW INDEX FROM DATABASE database_name
+  {
+    $$.val = &tree.ShowDatabaseIndexes{Database: tree.Name($5)}
+  }
 | SHOW INDEXES FROM table_name
   {
     $$.val = &tree.ShowIndexes{Table: $4.unresolvedObjectName()}
   }
+| SHOW INDEXES FROM DATABASE database_name
+  {
+    $$.val = &tree.ShowDatabaseIndexes{Database: tree.Name($5)}
+  }
 | SHOW INDEXES error // SHOW HELP: SHOW INDEXES
 | SHOW KEYS FROM table_name
   {
     $$.val = &tree.ShowIndexes{Table: $4.unresolvedObjectName()}
   }
+| SHOW KEYS FROM DATABASE database_name
+  {
+    $$.val = &tree.ShowDatabaseIndexes{Database: tree.Name($5)}
+  }
 | SHOW KEYS error // SHOW HELP: SHOW INDEXES
 
 // %Help: SHOW CONSTRAINTS - list constraints

pkg/sql/sem/tree/show.go

@@ -155,6 +155,17 @@ func (node *ShowIndexes) Format(ctx *FmtCtx) {
 	ctx.FormatNode(node.Table)
 }
 
+// ShowDatabaseIndexes represents a SHOW INDEXES FROM DATABASE statement.
+type ShowDatabaseIndexes struct {
+	Database Name
+}
+
+// Format implements the NodeFormatter interface.
+func (node *ShowDatabaseIndexes) Format(ctx *FmtCtx) {
+	ctx.WriteString("SHOW INDEXES FROM DATABASE ")
+	ctx.FormatNode(&node.Database)
+}
+
 // ShowQueries represents a SHOW QUERIES statement
 type ShowQueries struct {
 	All     bool

pkg/sql/sem/tree/stmt.go

@@ -684,11 +684,17 @@ func (*ShowGrants) StatementType() StatementType { return Rows }
 // StatementTag returns a short string identifying the type of statement.
 func (*ShowGrants) StatementTag() string { return "SHOW GRANTS" }
 
+// StatementType implements the Statement interface.
+func (*ShowDatabaseIndexes) StatementType() StatementType { return Rows }
+
+// StatementTag returns a short string identifying the type of statement.
+func (*ShowDatabaseIndexes) StatementTag() string { return "SHOW INDEXES FROM DATABASE" }
+
 // StatementType implements the Statement interface.
 func (*ShowIndexes) StatementType() StatementType { return Rows }
 
 // StatementTag returns a short string identifying the type of statement.
-func (*ShowIndexes) StatementTag() string { return "SHOW INDEXES" }
+func (*ShowIndexes) StatementTag() string { return "SHOW INDEXES FROM TABLE" }
 
 // StatementType implements the Statement interface.
 func (*ShowQueries) StatementType() StatementType { return Rows }
@@ -915,6 +921,7 @@ func (n *ShowColumns) String() string               { return AsString(n) }
 func (n *ShowConstraints) String() string           { return AsString(n) }
 func (n *ShowCreate) String() string                { return AsString(n) }
 func (n *ShowDatabases) String() string             { return AsString(n) }
+func (n *ShowDatabaseIndexes) String() string       { return AsString(n) }
 func (n *ShowGrants) String() string                { return AsString(n) }
 func (n *ShowHistogram) String() string             { return AsString(n) }
 func (n *ShowIndexes) String() string               { return AsString(n) }