CreateQuery compress_table (children 3) Identifier compress_table Columns definition (children 1) ExpressionList (children 4) ColumnDeclaration key (children 1) DataType UInt64 ColumnDeclaration value1 (children 2) DataType String Function CODEC (children 1) ExpressionList (children 1) Function Default ColumnDeclaration value2 (children 2) DataType UInt64 Function CODEC (children 1) ExpressionList (children 2) Function Delta Function Default ColumnDeclaration value3 (children 2) DataType String Function CODEC (children 1) ExpressionList (children 1) Function ZSTD (children 1) ExpressionList (children 1) Literal UInt64_10 Storage definition (children 2) Function MergeTree (children 1) ExpressionList Identifier key