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Diffstat (limited to 'src/include/nodes/execnodes.h')
| -rw-r--r-- | src/include/nodes/execnodes.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h index 57288013795..17c42d4a88a 100644 --- a/src/include/nodes/execnodes.h +++ b/src/include/nodes/execnodes.h @@ -3,6 +3,12 @@ * execnodes.h * definitions for executor state nodes * + * ExprState represents the evaluation state for a whole expression tree. + * Most Expr-based plan nodes do not have a corresponding expression state + * node, they're fully handled within execExpr* - but sometimes the state + * needs to be shared with other parts of the executor, as for example + * with SubPlanState, which nodeSubplan.c has to modify. + * * * Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California |