ShowColumnsCommand Leaf Logical Command¶

ShowColumnsCommand is a LeafRunnableCommand that represents ShowColumns logical command at logical query resolution phase.

SHOW COLUMNS (FROM | IN) table_identifier [(FROM | IN) database];

Creating Instance¶

ShowColumnsCommand takes the following to be created:

• Database Name
• Table Name
• Output Attributes

ShowColumnsCommand is created when:

• ResolveSessionCatalog logical resolution rule is requested to resolve ShowColumns logical operator