33 lines
879 B
Go
33 lines
879 B
Go
package jet
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type alias struct {
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expression Expression
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alias string
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}
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func newAlias(expression Expression, aliasName string) Projection {
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return &alias{
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expression: expression,
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alias: aliasName,
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}
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}
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func (a *alias) fromImpl(subQuery SelectTable) Projection {
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// if alias is in the form "table.column", we break it into two parts so that ProjectionList.As(newAlias) can
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// overwrite tableName with a new alias. This method is called only for exporting aliased custom columns.
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// Generated columns have default aliasing.
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tableName, columnName := extractTableAndColumnName(a.alias)
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column := NewColumnImpl(columnName, tableName, nil)
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column.subQuery = subQuery
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return &column
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}
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func (a *alias) serializeForProjection(statement StatementType, out *SQLBuilder) {
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a.expression.serialize(statement, out)
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out.WriteString("AS")
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out.WriteAlias(a.alias)
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}
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